I recently did a challenge that was 100 push ups a day AND 100 pull ups a day for a whole month. It was pretty tough at first, but after about a week of it I felt like I could keep going on autopilot.

What sounds like “just push-ups” becomes a completely different challenge when you try to complete 60 perfect reps in only 30 seconds, because explosive speed, strict form, muscular endurance, and ...