For our purposes here, high-intensity cardio falls between about 80 to 90 percent of your maximum heart rate (MHR) or, if you're not using heart rate zones, about a 6 to 8 on a 10-point perceived exertion scale. What this translates to is exercise at a level that feels challenging and leaves you too breathless to talk in complete sentences. But you're not going all out, as in sprinting as fast as you can. There's no doubt that some high-intensity training work can be helpful for weight loss as well as improving endurance and aerobic capacity.
Try this treadmill workout: Walk or jog on an incline for five to 10 minutes. Maintain a jog for another five to 10 minutes, then pick your pace up again and start running. "This doesn't have to be an all-out sprint," says Penfold, but you should be working hard enough that you can't carry a conversation. Spend five minutes running, then drop your pace back down to a jog. Continue alternating with five to 10 minutes of jogging and five to 10 minutes of running for 30 to 45 minutes.
There’s a reason everyone harps on about protein: Not only does it help keep you full, but it’s also responsible for repairing the tiny tears caused by strength training in your muscles. This helps them grow bigger and stronger, nudging out body fat in the process. As a general rule of thumb, aim to get at least 70 grams of protein throughout the day, says Dr. Cheskin.