Time Trials need to have a prompt, an alert, or preferably both when you expect the user to carry out a button press to begin the trial. If there was an instruction, it disappeared before I could see it, and I ended up just looking at a timer for ten minutes before I couldn't run anymore and found out the activity hadn't even started. Not sure why this even requires a button press, but I allow that I can't foresee every potential scenario. There's a ton of real estate on the watch face - just a static message "press lap button to begin time trial" would be a 1000% improvement. Baffling that it's been designed this way.