But the idea that banging out a workout when you don't have access to your usual equipment or space is one that trainers are quick to debunk. Sure, they know their way around a gym floor and a smart workout program, but they also know that when you're traveling, ultra busy, or just don't feel like dealing with the gym, a routine of challenging bodyweight exercises will get the job done.
Toning your arm muscles will certainly get you the definition you seek, but adding some extra protein to your diet will get you there even faster. Research published in The Journal of Nutrition reveals that packing on the protein increased muscle synthesis by as much as 25 percent, meaning that you can build stronger muscles faster, right in the privacy of your own home.
While a Bulgarian split squat isn't technically a zero-equipment move, they can still be done pretty much anytime, anywhere. "It activates many muscle groups and can be performed with any lifted surface, like a couch, bench, small table, or even an airport chair," says DiDomenico. The move is a major lower-body burner—you'll feel it in your quads, glutes, inner thighs, hamstrings, and even your calves.