I completed my 30 day Challenges. I picked squats and 5 minute plank.
The results are that I lost about 1/2" on thighs and .75" on hips and waist.
I think it worked great. The squats weren't boring since I did them watching something on tv. The planks were boring and HARD. I had only ever done 30 seconds at a time so this really was a challenge for me. I don't think I will do the plank again for that long but keeping it at about 2 1/2 minutes will be just fine.
Done and done.