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Handles get more hands-on time than almost any other piece of a resistance band system, but they rarely get a second thought. Underneath the grip, there's a rigid core (usually molded ABS or metal) holding the shape, a foam or rubber layer built for feel and durability, an attachment point — fixed D-ring or swiveling — and nylon or polyester webbing rated by denier and stitch pattern. None of it is flashy, but each choice is why handle quality varies so much from one brand to the next. Here's what's actually inside one.

Ever notice the "10 LBS" or "50 LBS" printed on a resistance tube and assume it works like a dumbbell's weight plate — a fixed number? It doesn't. A tube's rating actually reflects the force needed to stretch it to a standardized length in controlled testing, and it's shaped by two things: the tube's wall thickness and outer diameter, along with whether it's made from natural latex or TPE. Here's what that rating really tells you — and why bands come in graduated sets instead of one size.