Running Running engages your glutes, hamstrings, and quads. If you’re a beginner, start out slow with a 20 minute workout and work your way up, walking when you need to. Run outside, use an elliptical machine (for less impact on your knees), or try this 30 minute treadmill incline routine: 5 minute warm-up jog at 2% incline 3 minute run at 4% incline 1 minute recovery jog at 5% incline 3 minute run at 6% incline 1 minute recovery jog at 5% incline 3 minute run at 7% incline 3 minute jog at 7% incline 2 minute run at 7% incline 2 minute jog at 5% incline 2 minute run at 3% incline 3 minute jog at 3% incline 2 minute cool-down jog or walk at 2% incline Cycling Cycling works all the same muscles as running but with less impact, which is great if you have bad knees. Take a 30 minute bike ride at least 5 times a week, go to a spin class, or try this 20 minute interval routine on the upright stationary bike: 5 minute warm-up 30 second sprint, hard intensity 30 second push, moderate intensity Repeat 4 times 1 minute easy recovery 1 minute sprint, hard intensity 30 second push, moderate intensity Repeat 4 times 1 minute easy recovery 45 second sprint, hard intensity 15 second easy recovery Repeat 3 times 2 minute easy cool-down Circuit Training This type of training alternates between heart-pumping moves and weight-training exercises to shed calories in small spurts and tone your muscles. Circuit training is also a great option if you tend to get bored during long stretches of cardio. Try this routine either at home or at the gym: 60 seconds jumping jacks 60 seconds squats 60 seconds jumping jacks 60 seconds hip raises 60 seconds jumping jacks 60 seconds standing side kicks (30 seconds on each side) Repeat 4 times 60 seconds jump rope 60 seconds lunges 60 seconds jump rope 30 seconds jump squats 60 seconds jump rope 60 seconds leg kick-backs (30 seconds on each side) Repeat 4 times