Resistance bands get stronger as they stretch, the opposite of a free weight, which stays the same weight through the whole rep, and that changing resistance curve makes bands especially useful for warm-ups, activation work, and adding accommodating resistance to barbell lifts like squats and bench presses. Looping a band around a barbell adds extra resistance at the top of a lift, exactly where a free weight alone tends to feel easiest, which teaches your body to accelerate through the whole range of motion instead of just grinding through the sticking point. Bands suit almost every lifter in some capacity: beginners use them for assisted pull-ups and mobility work, and advanced lifters use them to add variable resistance and address specific sticking points in their main lifts. They're also the single most portable strength tool available, a full set of bands weighs next to nothing and fits in a backpack, which makes them the obvious choice for travel workouts or training away from a gym. Program band work in higher rep ranges, 15 to 25, for activation and conditioning-style work, and use heavier bands more sparingly for accommodating resistance on compound lifts. The most common mistake is relying on bands as a primary strength tool rather than a supplement to free weights, since bands are excellent for detail work but can't replicate the absolute loading a barbell or dumbbell provides. A second is skipping proper anchoring, which turns a useful tool into a genuine safety hazard if a band snaps loose under tension.