Resistance bands provide variable tension for strength training, rehab, and flexibility across all fitness levels. Therapy bands (flat, handle-free) suit gentle mobility work; loop bands (continuous circles, mini/full-size) target glutes/legs via squats, lateral walks; tube bands (handled cords) enable upper-body pulls, presses, curls; figure-8 bands (dual handles) focus chest/shoulders; ring/lateral bands (ankle cuffs) aid hip abductions. Color-coded levels (yellow light-green heavy) progress resistance; stackable for intensity. Portable, joint-friendly alternative to weights, they improve posture, muscle activation, circulation with full-range motion.