goal-oriented teenager working on his body using resistance rubber performs strength training. preparing for the sports season.

muscle fitness exercise athlete person stretching gym training health adolescence balance band teenager workout bodybuilding determination strength muscular power care gymnastics strong model guy practice masculine healthy lifestyle sportswear sportsman energy resistance rubber upper body core trunk belly chest abs torso physical tool young adult motivation pull outside goal success runner instructor routine position goal-oriented working performs training preparing sports season exercising body outdoor playground