I love the idea of mixing it up. Last week's challange carried over this week for me. I tried a couple new workouts this week. One of which took a lot of courage to do in public; afraid I was going to look like an idiot. I did a plank at the end of the treadmill and walked with my hands. My stomach muscles wanted to die, but I was able to increase the amount of time I did it each day (pretty sure by next week I will have a six pack). I also attached a copy of the second treadmill exercise so you all can try both!!!