diff --git a/backend/src/services/sport/client.ts b/backend/src/services/sport/client.ts
index ca15c6f..47d5c8b 100644
--- a/backend/src/services/sport/client.ts
+++ b/backend/src/services/sport/client.ts
@@ -98,6 +98,7 @@ export class SportClient extends ApiClient {
       title: t.title,
       startsAt: t.start,
       endsAt: t.end,
+      groupId: t.extendedProps.group_id,
       checkedIn: t.extendedProps.checked_in ?? false,
       checkInAvailable: t.extendedProps.can_check_in ?? false,
     }))
@@ -119,6 +120,7 @@ export class SportClient extends ApiClient {
       checkedIn: raw.checked_in ?? false,
       checkInAvailable: raw.can_check_in ?? false,
       location: raw.training.place,
+      groupId: raw.training.group.id,
       teachers: raw.training.group.teachers.map(t => ({
         id: t.id,
         firstName: t.first_name,
diff --git a/backend/src/services/sport/types.ts b/backend/src/services/sport/types.ts
index f2077f1..4307e8d 100644
--- a/backend/src/services/sport/types.ts
+++ b/backend/src/services/sport/types.ts
@@ -10,6 +10,7 @@ export type TrainingInfo = {
   title: string
   startsAt: Date
   endsAt: Date
+  groupId: number
   checkedIn: boolean
   checkInAvailable: boolean
 }
@@ -23,6 +24,7 @@ export type TrainingDetailed = {
   accredited: boolean
   checkedIn: boolean
   checkInAvailable: boolean
+  groupId: number
   location: string
   teachers: {
     id: number