Jump Start on New Year's Resolution

So for Black Friday, I went to Dick's Sporting Goods and bought a medicine ball, a jump rope, and a new gym bag. My New Year's resolution (well, one of them) is to get back in shape. In high school, I took part in advanced physical conditioning (APC), which is basically a weight lifting class. For 70 minutes/5 days a week, we did strength training and cardio. On top of that, I taught gymnastics 4-5 days a week for 4+ hours at a time, which was even more cardio. Plus I was a cheerleader, so jumping, tumbling, and stunting 2-3 nights a week (more during basketball season when there are multiple games each week). It was all built in to my schedule back then and I never thought about how much I was doing all the time. When college started, I kept up with running: I ran a half marathon every other year, countless 5k and 10k races (an accidental 10 mile race thinking it was a 10k), and maintained a decent weight until that lovely 21st birthday--umm, becoming an "adult"...