This is day 1 of my 28 day fitness challenge to lose 4% of my body weight. I am participating in the boot camp that can be found on the Sisterhood of the Shrinking Jeans website. The program uses burst training, so first thing I had to do was five 30 second sprints. I would call my pace more of a jog after the first sprint and each one after got slower and slower. Thirty seconds is a long time to sprint, just saying.