PopsugarFitnessWorkouts30-Day Fitness ChallengeCrush Your 2019 Fitness Goals With This 30-Day Total-Body Challenge January 10, 2019 by Jenny Sugar View On One Page Photo 8 of 24 ADVERTISEMENT () Start Slideshow Share This LinkCopy ← Use Arrow Keys → 8 High Knees Hold your hands at waist level.Hop the right knee up toward your hands, then quickly switch legs and hop the left knee up. This counts as one rep.PreviousNext Start Slideshow WorkoutsStrength TrainingFitness ChallengesBeginner Workouts15-Minute Workouts