Begin the year with a total-body circuit. You'll fire up your back, hamstrings, and glutes, then dive into bodyweight moves infused with boxing flavor. Do this workout three times a week, resting at least 1 day between sessions. On your off days, go for a 20-minute run.

Featured Trainer: Ngo Okafor is a two-time Golden Gloves boxing champ and the owner/founder of Iconoclast Fitness Studio in Manhattan. He constructs workouts around classic bodybuilding moves, with occasional dashes of boxing spice, as youll see in the burpee below.

The Warmup

Start with 30 seconds of jumping jacks, then do 30 seconds of high knees, running in place while driving your knees upward. Then do 1 Spider-Man T-spine stretch on each side. Rest 30 seconds. Repeat twice.

Spider-Man T-Spine Stretch

Eb says:

Its convenient to let your butt ride up high when you get fatigued during mountain climbers. Resist that urge and keep your butt below (or on the same level as) your shoulders.