diff --git a/frontend/www/scripts/exercise.js b/frontend/www/scripts/exercise.js
index f845fe1844b633cf1b0bf1365eee4323c4c84bcc..24ef1862893160cb60522c397b57e83eaa214efe 100644
--- a/frontend/www/scripts/exercise.js
+++ b/frontend/www/scripts/exercise.js
@@ -10,7 +10,7 @@ class MuscleGroup {
         this.validTypes = ["Legs", "Chest", "Back", "Arms", "Abdomen", "Shoulders"]
 
         this.type = this.validTypes.includes(type) ? type : undefined;
-    };
+    }
 
     setMuscleGroupType = (newType) => {
         this.isValidType = false;
@@ -23,7 +23,7 @@ class MuscleGroup {
             alert("Invalid muscle group!");
         }
 
-    };
+    }
     
     getMuscleGroupType = () => {
         console.log(this.type, "SWIOEFIWEUFH")
@@ -41,7 +41,7 @@ function handleCancelButtonDuringEdit() {
 
     cancelButton.removeEventListener("click", handleCancelButtonDuringEdit);
 
-    let form = document.querySelector("#form-exercise");
+    const form = document.querySelector("#form-exercise");
     if (oldFormData.has("name")) form.name.value = oldFormData.get("name");
     if (oldFormData.has("description")) form.description.value = oldFormData.get("description");
     if (oldFormData.has("duration")) form.duration.value = oldFormData.get("duration");
@@ -64,24 +64,24 @@ function handleCancelButtonDuringCreate() {
 
 async function createExercise() {
     document.querySelector("select").removeAttribute("disabled")
-    let form = document.querySelector("#form-exercise");
-    let formData = new FormData(form);
-    let body = {"name": formData.get("name"), 
+    const form = document.querySelector("#form-exercise");
+    const formData = new FormData(form);
+    const body = {"name": formData.get("name"), 
                 "description": formData.get("description"),
                 "duration": formData.get("duration"),
                 "calories": formData.get("calories"),
                 "muscleGroup": formData.get("muscleGroup"), 
                 "unit": formData.get("unit")};
 
-    let response = await sendRequest("POST", `${HOST}/api/exercises/`, body);
+    const response = await sendRequest("POST", `${HOST}/api/exercises/`, body);
 
     if (response.ok) {
         window.location.replace("exercises.html");
-    } else {
-        let data = await response.json();
-        let alert = createAlert("Could not create new exercise!", data);
-        document.body.prepend(alert);
+        return;
     }
+    const data = await response.json();
+    const alert = createAlert("Could not create new exercise!", data);
+    document.body.prepend(alert);
 }
 
 function handleEditExerciseButtonClick() {
@@ -96,15 +96,15 @@ function handleEditExerciseButtonClick() {
 
     cancelButton.addEventListener("click", handleCancelButtonDuringEdit);
 
-    let form = document.querySelector("#form-exercise");
+    const form = document.querySelector("#form-exercise");
     oldFormData = new FormData(form);
 }
 
 async function deleteExercise(id) {
-    let response = await sendRequest("DELETE", `${HOST}/api/exercises/${id}/`);
+    const response = await sendRequest("DELETE", `${HOST}/api/exercises/${id}/`);
     if (!response.ok) {
-        let data = await response.json();
-        let alert = createAlert(`Could not delete exercise ${id}`, data);
+        const data = await response.json();
+        const alert = createAlert(`Could not delete exercise ${id}`, data);
         document.body.prepend(alert);
     } else {
         window.location.replace("exercises.html");
@@ -112,71 +112,70 @@ async function deleteExercise(id) {
 }
 
 async function retrieveExercise(id) {
-    let response = await sendRequest("GET", `${HOST}/api/exercises/${id}/`);
+    const response = await sendRequest("GET", `${HOST}/api/exercises/${id}/`);
 
     console.log(response.ok)
 
     if (!response.ok) {
-        let data = await response.json();
-        let alert = createAlert("Could not retrieve exercise data!", data);
+        const data = await response.json();
+        const alert = createAlert("Could not retrieve exercise data!", data);
         document.body.prepend(alert);
-    } else {
-        document.querySelector("select").removeAttribute("disabled")
-        let exerciseData = await response.json();
-        let form = document.querySelector("#form-exercise");
-        let formData = new FormData(form);
-
-        for (let key of formData.keys()) {
-            let selector
-            key !== "muscleGroup" ? selector = `input[name="${key}"], textarea[name="${key}"]` : selector = `select[name=${key}]`
-            let input = form.querySelector(selector);
-            let newVal = exerciseData[key];
-            input.value = newVal;
-        }
-        document.querySelector("select").setAttribute("disabled", "")
+        return;
+    }
+    document.querySelector("select").removeAttribute("disabled")
+    const exerciseData = await response.json();
+    const form = document.querySelector("#form-exercise");
+    const formData = new FormData(form);
+
+    for (const key of formData.keys()) {
+        const selector = key !== "muscleGroup" ? `input[name="${key}"], textarea[name="${key}"]` : `select[name=${key}]`
+        const input = form.querySelector(selector);
+        const newVal = exerciseData[key];
+        input.value = newVal;
     }
+    document.querySelector("select").setAttribute("disabled", "")
 }
 
 async function updateExercise(id) {
-    let form = document.querySelector("#form-exercise");
-    let formData = new FormData(form);
+    const form = document.querySelector("#form-exercise");
+    const formData = new FormData(form);
 
-    let muscleGroupSelector = document.querySelector("select")
+    const muscleGroupSelector = document.querySelector("select")
     muscleGroupSelector.removeAttribute("disabled")
 
-    let selectedMuscleGroup = new MuscleGroup(formData.get("muscleGroup"));
+    const selectedMuscleGroup = new MuscleGroup(formData.get("muscleGroup"));
 
-    let body = {"name": formData.get("name"), 
+    const body = {"name": formData.get("name"), 
                 "description": formData.get("description"),
                 "duration": formData.get("duration"),
                 "calories": formData.get("calories"),
                 "muscleGroup": selectedMuscleGroup.getMuscleGroupType(),
                 "unit": formData.get("unit")};
-    let response = await sendRequest("PUT", `${HOST}/api/exercises/${id}/`, body);
+    const response = await sendRequest("PUT", `${HOST}/api/exercises/${id}/`, body);
 
     if (!response.ok) {
-        let data = await response.json();
-        let alert = createAlert(`Could not update exercise ${id}`, data);
+        const data = await response.json();
+        const alert = createAlert(`Could not update exercise ${id}`, data);
         document.body.prepend(alert);
-    } else {
-        muscleGroupSelector.setAttribute("disabled", "")
-        // duplicate code from handleCancelButtonDuringEdit
-        // you should refactor this
-        setReadOnly(true, "#form-exercise");
-        okButton.className += " hide";
-        deleteButton.className += " hide";
-        cancelButton.className += " hide";
-        editButton.className = editButton.className.replace(" hide", "");
+        return;
+    }
+    muscleGroupSelector.setAttribute("disabled", "")
+    // duplicate code from handleCancelButtonDuringEdit
+    // you should refactor this
+    setReadOnly(true, "#form-exercise");
+    okButton.className += " hide";
+    deleteButton.className += " hide";
+    cancelButton.className += " hide";
+    editButton.className = editButton.className.replace(" hide", "");
     
-        cancelButton.removeEventListener("click", handleCancelButtonDuringEdit);
+    cancelButton.removeEventListener("click", handleCancelButtonDuringEdit);
         
-        oldFormData.delete("name");
-        oldFormData.delete("description");
-        oldFormData.delete("duration");
-        oldFormData.delete("calories");
-        oldFormData.delete("muscleGroup");
-        oldFormData.delete("unit");
-    }
+    oldFormData.delete("name");
+    oldFormData.delete("description");
+    oldFormData.delete("duration");
+    oldFormData.delete("calories");
+    oldFormData.delete("muscleGroup");
+    oldFormData.delete("unit");
 }
 
 window.addEventListener("DOMContentLoaded", async () => {
@@ -194,18 +193,17 @@ window.addEventListener("DOMContentLoaded", async () => {
         await retrieveExercise(exerciseId);
 
         editButton.addEventListener("click", handleEditExerciseButtonClick);
-        deleteButton.addEventListener("click", (async (id) => await deleteExercise(id)).bind(undefined, exerciseId));
-        okButton.addEventListener("click", (async (id) => await updateExercise(id)).bind(undefined, exerciseId));
+        deleteButton.addEventListener("click", (async (id) => deleteExercise(id)).bind(undefined, exerciseId));
+        okButton.addEventListener("click", (async (id) => updateExercise(id)).bind(undefined, exerciseId));
+        return;
     } 
     //create
-    else {
-        setReadOnly(false, "#form-exercise");
+    setReadOnly(false, "#form-exercise");
 
-        editButton.className += " hide";
-        okButton.className = okButton.className.replace(" hide", "");
-        cancelButton.className = cancelButton.className.replace(" hide", "");
+    editButton.className += " hide";
+    okButton.className = okButton.className.replace(" hide", "");
+    cancelButton.className = cancelButton.className.replace(" hide", "");
 
-        okButton.addEventListener("click", async () => await createExercise());
-        cancelButton.addEventListener("click", handleCancelButtonDuringCreate);
-    }
+    okButton.addEventListener("click", async () => createExercise());
+    cancelButton.addEventListener("click", handleCancelButtonDuringCreate);
 });
\ No newline at end of file
diff --git a/frontend/www/scripts/gallery.js b/frontend/www/scripts/gallery.js
index f9c07b449947470c8df29c8f51894758cf38c025..46b208dfe1650ad8187ad742234ffd7f274f8288 100644
--- a/frontend/www/scripts/gallery.js
+++ b/frontend/www/scripts/gallery.js
@@ -1,21 +1,20 @@
 let goBackButton;
-let submitNewFileButton;
 
 async function retrieveWorkoutImages(id) {  
     let workoutData = null;
-    let response = await sendRequest("GET", `${HOST}/api/workouts/${id}/`);
+    const response = await sendRequest("GET", `${HOST}/api/workouts/${id}/`);
     if (!response.ok) {
-        let data = await response.json();
-        let alert = createAlert("Could not retrieve workout data!", data);
+        const data = await response.json();
+        const alert = createAlert("Could not retrieve workout data!", data);
         document.body.prepend(alert);
     } else {
         workoutData = await response.json();
 
-        document.getElementById("workout-title").innerHTML = "Workout name: " + workoutData["name"];
-        document.getElementById("workout-owner").innerHTML = "Owner: " + workoutData["owner_username"];
+        document.getElementById("workout-title").innerHTML = `Workout name: ${workoutData.name}`;
+        document.getElementById("workout-owner").innerHTML = `Owner: ${workoutData.owner_username}`;
 
-        let hasNoImages = workoutData.files.length == 0;
-        let noImageText = document.querySelector("#no-images-text");
+        const hasNoImages = workoutData.files.length == 0;
+        const noImageText = document.querySelector("#no-images-text");
 
         if(hasNoImages){
             noImageText.classList.remove("hide");
@@ -25,34 +24,34 @@ async function retrieveWorkoutImages(id) {
         noImageText.classList.add("hide");
 
         
-        let filesDiv = document.getElementById("img-collection");
-        let filesDeleteDiv = document.getElementById("img-collection-delete");
+        const filesDiv = document.getElementById("img-collection");
+        const filesDeleteDiv = document.getElementById("img-collection-delete");
         
         const currentImageFileElement = document.querySelector("#current");
         let isFirstImg = true;
 
         let fileCounter = 0;
 
-        for (let file of workoutData.files) {
-            let a = document.createElement("a");
+        for (const file of workoutData.files) {
+            const a = document.createElement("a");
             a.href = file.file;
-            let pathArray = file.file.split("/");
+            const pathArray = file.file.split("/");
             a.text = pathArray[pathArray.length - 1];
             a.className = "me-2";
 
             
 
-            let isImage = ["jpg", "png", "gif", "jpeg", "JPG", "PNG", "GIF", "JPEG"].includes(a.text.split(".")[1]);
+            const isImage = ["jpg", "png", "gif", "jpeg", "JPG", "PNG", "GIF", "JPEG"].includes(a.text.split(".")[1]);
 
             if(isImage){
-                let deleteImgButton = document.createElement("input");
+                const deleteImgButton = document.createElement("input");
                 deleteImgButton.type = "button";
                 deleteImgButton.className = "btn btn-close";
                 deleteImgButton.id = file.url.split("/")[file.url.split("/").length - 2];
                 deleteImgButton.addEventListener('click', () => handleDeleteImgClick(deleteImgButton.id, "DELETE", `Could not delete workout ${deleteImgButton.id}!`, HOST, ["jpg", "png", "gif", "jpeg", "JPG", "PNG", "GIF", "JPEG"]));
                 filesDeleteDiv.appendChild(deleteImgButton);
                 
-                let img = document.createElement("img");
+                const img = document.createElement("img");
                 img.src = file.file;
                 
                 filesDiv.appendChild(img);
@@ -89,9 +88,9 @@ async function retrieveWorkoutImages(id) {
 }
 
 async function validateImgFileType(id, host_variable, acceptedFileTypes) {
-    let file = await sendRequest("GET", `${host_variable}/api/workout-files/${id}/`);
-    let fileData = await file.json();
-    let fileType = fileData.file.split("/")[fileData.file.split("/").length - 1].split(".")[1];
+    const file = await sendRequest("GET", `${host_variable}/api/workout-files/${id}/`);
+    const fileData = await file.json();
+    const fileType = fileData.file.split("/")[fileData.file.split("/").length - 1].split(".")[1];
     
     return acceptedFileTypes.includes(fileType);
 }
@@ -102,11 +101,11 @@ async function handleDeleteImgClick (id, http_keyword, fail_alert_text, host_var
         return
     }
 
-    let response = await sendRequest(http_keyword, `${host_variable}/api/workout-files/${id}/`);
+    const response = await sendRequest(http_keyword, `${host_variable}/api/workout-files/${id}/`);
 
     if (!response.ok) {
-        let data = await response.json();
-        let alert = createAlert(fail_alert_text, data);
+        const data = await response.json();
+        const alert = createAlert(fail_alert_text, data);
         document.body.prepend(alert);
     } else {
         location.reload();
@@ -122,10 +121,6 @@ function handleGoBackToWorkoutClick() {
 window.addEventListener("DOMContentLoaded", async () => {
 
     goBackButton = document.querySelector("#btn-back-workout");
-    goBackButton.addEventListener('click', handleGoBackToWorkoutClick);
-
-    const urlParams = new URLSearchParams(window.location.search);
-    const id = urlParams.get('id');
-    let workoutData = await retrieveWorkoutImages(id);   
+    goBackButton.addEventListener('click', handleGoBackToWorkoutClick); 
 
 });
\ No newline at end of file