grueling, arduous, physical exertion, vigorous, exhausting, hectic, tedious, sedentary, rigorous, intense, intensive, torturous, laborious, aerobic, stressful, aerobic exercise, fatiguing, gruelling, herculean, toilsome, leisurely, monotonous, tortuous, wearisome, painstaking, limber, calisthenic, futile, sisyphean, routine, callisthenic, tiresome, feverish, excruciating, frantic, brisk, repetitive, challenging, enjoyable, physical, pleasurable, regimented, daunting, uphill, frenetic, diligent, painful, superhuman, labor intensive, thankless, difficult, carbo loading, fruitless, risky, winded, worthwhile, complicated, consuming, commendable, stiff, masochistic, lengthy, hazardous, invigorating, spirited, prolonged, bearable, sweaty, heroic, onerous, padless, pleasant, asana, perilous, yomp, exhaustive, unstimulating, restful, mountain biking, fitter, rewarding, exhilarating, conscientious, inadvisable, hard, unpleasant, backbreaking, advisable, tai chi, treacherous, muscular, bumpiest, effortful, delicate, manly, unrewarding, sapping, hydrated, physical therapy, behavior modification, lightheaded, creditable, frustrating, unremitting, persevering, profitless

., athletic supporter, farming, fartlek, fight, grasping, jock, jockstrap, limber up, loosen up, oxygen deficit, press, prolusion, pulling, push, strenuously, struggle, supporter, suspensor, tune-up, warm-up, warm up

arduous, effortful, energetic, straining