Your next workout is only as good as your recovery – trust us ... According to Upton, a 4-day workout split is the best ...

This workout is split into four sets, with two sets of bird dogs and half get-ups and two sets of modified side plank leg lifts and single-leg glute bridges. Sign up to get the BEST of Tom's Guide ...

How to group your muscles to get the most beneficial session for you. But with so many muscles in the body, how do you factor all of them in? That’s where muscle grouping comes into play.