To delete an activity, you must enter the Edit view of the activity. The Edit option is found in the Activities section on the right side of the page beside the View option.
Now you will be on the Custom Activities page, scroll to the bottom of the page where a delete option will be present. Press the Delete option. A prompt warning you the activity will be marked as deleted will present itself, select Okay and the activity will be deleted.
To view deleted exercises, go to the Activities page. On the top right of the page you will find the Show Deleted Activities option.
On this page you will be able to restore all the deleted activities but you will not be able to edit activities. Restoring an activity will bring it back to the master list and the option to edit an activity will return. To restore an exercise, tap the Restore option on the right-hand side of the screen.