fartlek Definition

aerobic exercise, plyometrics, jog, calisthenics, cardio, endurance, periodization, racewalking, treadmill, jazzercise, marathon, physical exertion, ergometer, exertion, miler, interval training, sprints, bpm, stairmaster, carbo loading, striders, repetitions, isometric exercise, workouts, erg, wpm, padless, callisthenics, exercycle, workout, cadence, ambulation, etape, situps, stopwatch, slowish, intervals, coaster brake, gasser, quals, sidecut, cardiopulmonary exercise, semitones, metronome, isometrics, rooty, kinesis, speedball, carbo, skelly, msec, pilates, kickdown, orienteering, sec, lactate, kays, medius, min, speed, mtb, exercisers, zippy, footraces, fettling, rogaine, loops, situp, accelerando, biking, acclimatization, expiratory, stamina, hatha yoga, rpms, gassers, stroboscope, thermotherapy, strenuousness, treo, luteal phase, liquidiser, decrescendo, canter, limber up, claudication, pedaling, descents, longe, glutes, strenuosity, quadrillionth, baud, orienteer, calories, durations, initialise, kermesse, moldboard, pedometer,