One typically doesn't associate training upper body by using a treadmill, says Jeffrey Beck, exercise specialist with the Intermountain Medical Center Heart Institute. It's definitely unconventional and you'll get some weird looks from people at the gym, but the following treadmill exercise routine will help strengthen your core if done a few times per week, Beck says.
1) Belt Push/Pull: This exercise is a variation of the plank and is terrific for strengthening the core! From a kneeling position, place both hands on the treadmill belt. Slowly push the belt forward until your upper body hovers over the belt. Push yourself back to starting position. Complete 3 sets of 10 reps.
2) Belt Push From Side Position: This movement is great for the obliques! Lie on your right side, placing your right hand on the treadmill belt. Push the belt until your right side hovers above the belt. Push yourself back to starting position. Do 10 reps and then switch sides. Complete 3 sets of 10 reps per side.
3) Belt Pull: This is a great move for working the upper body and revving up your heart rate! From a kneeling position, place both hands on the treadmill belt. Pull the belt toward you and do it continuously for 30 seconds. Rest for 30 seconds and repeat. Do 3 sets.