Men's Training Shorts (Activewear)

Stretch is what separates a training short from every other short you own. The fabric is a knit carrying roughly 5 to 15 percent elastane. It lengthens in two directions and returns to shape instead of bagging at the knee. Inseams land at 7 to 9 inches, finishing just above the kneecap on most people. Most pairs arrive without a liner, on the assumption you already wear performance underwear.

Construction follows the movements. A gusset, meaning a diamond panel set into the crotch instead of four seams meeting at one point, is what lets you drop into a deep squat without the seam pulling across you. Pockets run deep and often zip, because a phone that slides out mid set costs you a screen. The waistband is thick, sometimes with an outer drawcord, so a loaded bar or a belt does not roll it over.

Running shorts are the closest relative and the easiest to confuse. Those are shorter, lighter, split at the hem and lined. Under a barbell the thin fabric goes slick on a bench and sheer under load. Joggers answer the same need in full length for cold rooms. Casual athletic shorts use lighter mesh or woven cloth and stop well short of the stretch a lunge needs. Weight in the hand is the quickest tell: a training short feels substantial.

Buy these if your training involves loading a bar, changing direction or dropping to the floor. Larger thighs do better in a knit, which gives instead of binding at the hem. Distance running in heat is the wrong use, where the heavier fabric holds water and starts to rub. A plain dark pair passes on the street if you need one short to do both, though the cut still reads as sportswear whatever shoes you add.

Squat in front of a mirror before you commit. Light gray and pastel knits go translucent under stretch, and that only appears at the bottom of the movement. Pocket bags should lie flat against the thigh instead of swinging out as you move. Cold water and a line beat a hot dryer here, because heat kills elastane faster than any amount of training does.