Okay, so I need to lose about 30-40 pounds. I want to use STS, and I'm doing the couch to 5k program for cardio. I was thinking I would do couch to 5k on the days I don't do STS (T, Th, Sa), and do STS M, W, F. But I feel like that's still not enough cardio. Couch to 5k is about 30 minutes...