As an ExorLive Go-user you are able to delete several activites at once, if they are a part of the same group (e.g. part of the same plan template).
Tap the activity you wish to delete in your plan.
Tap the "trashbin"- icon in the upper right corner.
If the activity is a part of a group, you wil get 2 choices:
- Delete only this activity (The one you tapped)
- Delete this and future activities in the group
Choose one of the options and tap "OK". The activity(ies) should now dissapear from your plan.