Haha right. Will do. But seriously, a hundred of each of those are quite heavy -- I feel it well today. All my shoulder muscles (the tiny ones too) feels stimulated.

I've been told that this is good approach (and more effective than using weights) to shoulder exercise, before the shoulder muscles are developed properly (mine aren't). Before I start doing shoulder exercise WITH weights, I'll be doing these for a while in between my main workouts, and focus on core exercise in the main workouts instead.