New technique
Training indeed is difficult, but as time passed it tended to get a lot easier. Although, it does feel like his muscles have become like stone due to all the soreness, day by day the pain is reducing.
Like Eric debated it a bit earlier, 4 hours doing the same exercise is just too much for him. So just slitting the exercise in half time-wise, helped in many terms. Here we are talking about the exercise where he almost touches his toes.
To be more specific, he is supposed to touch his toes but found it very difficult. So Kazer made him start with a couple of feet away from his toes, it fairly is better. In a matter of weeks he will be able to do the exercise properly.
As for the second exercise, it doesn't have a minimum time requirement. It used too, but for now it would be pointless since he hasn't yet learned how to do it. As in, he still can't balance himself with his head.