I recieved the cd cet as a gift and I am quite suprised at how fast I am blowing up. I grapple for 3 hours a day, weight train 4 to 5 days a week and do the tread for 30 minutes after every weight workout, but for some reason after 3 rds of 2 minutes my heart feels like its going to explode! and this is just from the boxing cd. Could I be over training? or does my body just need to get used this new workout? has anyone used this program before?