Today is the 1/2 way point for all of my challenges, and everything is going well except the stupid plank. I hit the minute mark a few days ago, but have been having a hard time making it any further (even 1 minute 10 seconds is too much). I don't know if its because I'm more tired this week (my schedule is rather crazy), or what. Frustrating!
As for the other two challenges, I like the exercises and the fact that I can get through everything fairly easily and quickly, but think it would be more beneficial if I increased the reps. For example, this past week it said to do 12 of each exercise, but I'm wondering if I should treat them as reps and do 2-3 sets of 12 (or something). Will have to investigate further!