In this exercise, you're dragging the sled behind you, but you're also pushing against the suspension trainer straps or ropes. The fact that you're holding on to two unstable handles forces the upper body and core muscles to work harder than they would with the stable, upright pole handles of the Prowler-style sled.
You can choose the best exercises, but if these four variables are screwed up you'll be leaving gains on the table. Here's everything you need to know.
We can always count on Christian to give us some great new movements that, in addition to spurring new muscle growth, will elicit bewildered stares from all the ACE certified trainers in the gym.