diff --git a/back_end/src/main/java/hackathon/FrisbYEE/rest/SessionResource.java b/back_end/src/main/java/hackathon/FrisbYEE/rest/SessionResource.java
index a2f7fa0..e09b313 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/rest/SessionResource.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/rest/SessionResource.java
@@ -133,7 +133,7 @@ public class SessionResource {
         }
     }
 
-    @GetMapping("/{id_session}/activities/add/{id_act}")
+    @PostMapping("/{id_session}/activities/add/{id_act}")
     @PreAuthorize("hasRole('coach') or hasRole('admin')")
     public ResponseEntity<?> addActivity(@PathVariable Integer id_sess, @PathVariable Integer id_act) {
         Session s = sessionDAO.findById(id_sess).get();
diff --git a/front_end/src/api.ts b/front_end/src/api.ts
index cf5a953..831d2fd 100644
--- a/front_end/src/api.ts
+++ b/front_end/src/api.ts
@@ -72,7 +72,7 @@ export const sessionService = {
     update: (id: number | string, data: any) => api.put(`/session/update/${id}`, data),
 
     getActivities: (sessionId: number | string) => api.get(`/session/${sessionId}/activities`),
-    addActivity: (sessionId: number | string, activity: any) => api.post(`/session/${sessionId}/activities`, activity),
+    addActivity: (sessionId: number | string, activityId: number) => api.post(`/session/${sessionId}/activities/${activityId}`),
     subscribe: (sessionId: number | string, userId: number | string) => api.post(`/session/${sessionId}/subscribe`, { userId }),
     unsubscribe: (sessionId: number | string, userId: number | string) => api.post(`/session/${sessionId}/unsubscribe`, { userId }),
 };