The One Punch Man workout isn't very hard for somebody in decent shape with a balanced physique. Most crossfitters aren't on anything.
100 Sit Ups
That's nothing. He also fought monsters and shit during his 10k runs. Who doesn't do that?
If you spread the workouts out, it's even easier. 10 of each 10 times a day? Then just end or start your day with the 10k run.
The hard part is "every day" because while overworking your body is hard, not taking rest days will definitely fuck you up after a while.