diff --git a/front_end/src/api.ts b/front_end/src/api.ts
index bd74948..c0098c3 100644
--- a/front_end/src/api.ts
+++ b/front_end/src/api.ts
@@ -50,6 +50,7 @@ export const athleteService = {
     getActivitiesForSession: (sessionId: number | string) => api.get(`/athletes/session/${sessionId}/activities`),
     getSessionsAfterDate: (athleteId: number | string, date: string) => api.get(`/athletes/${athleteId}/session/after/${encodeURIComponent(date)}`),
     getSessionsBetweenDates: (athleteId: number | string, startDate: string, endDate: string) => api.get(`/athletes/${athleteId}/session/between/${encodeURIComponent(startDate)}/${encodeURIComponent(endDate)}`),
+    addActivity: (id_sess: number, id_act: number) => api.get(`/${id_sess}/activities/add/${id_act}`)
 };
 
 export const activiteService = {