Consider changing your routine a bit. Instead of running 20 minutes on the treadmill, try stair-climbing. You can burn as many as 250 calories in that time. You need to run at least half an hour to get the same result.
The stepmill (a.k.a. stairmaster or stepper) has similar effects – it strengthens your thighs, buttocks, and calves – but your legs go through a full range of motion, and that is pivotal for shaping tones muscles. Calves, hamstrings, quadriceps and glutes are trained when you do a lot of reps. That’s how you build lean muscle and burn fat. You even work out your core because you use those muscle to keep you balance.
This cardio machine is not very popular among gym-goers, certainly not compared to treadmills or elliptical machines. The stepper is a lot more challenging than either of the other two but even more rewarding – you lose weight, build stamina, and form beautiful legs.
Stair-climbing is a great cardio exercise that doesn’t put a lot of pressure on the joints. You don’t bounce as much (and that’s helpful when you have eaten recently and your body hasn’t digested the food yet) and you target muscles in your lower body if you turn sideways or even backwards.
Do the exercise in intervals. You’re likely going to be sweating long before the workout is over.