Swipe an activity to the right to show the plus button or keep it swiping to show directly the counter menu
Tap the plus button to show the counter menu
Select the number of units accomplished, and tap outside to close and save it
Swipe an activity to left instead, to show the skip/restore button. This will make the activity collapse and go to the top of the day's timeline
Tap on the activity again to expand it and then swipe again to the left to restore the normal status of the activity
Another useful gesture is to long press on an activity to enter the edit menu. Tap on the More options to access the full menu. Please notice that in case of repeating activities, the reduced menu will only edit the specific activity occurrence in that day, by expanding it instead, you’ll modify all occurrences.