Too many tough days at the office or ongoing arguments with family members can sabotage your weight-loss efforts, says Jeremy Shore, C.S.C.S., a group education director for Matrix Fitness. When your body is stressed, your cortisol levels rise, telling your body to store fat for protection, says Shore. While that might be helpful in the Amazon, it's not going to save you from your boss's emails. Shore recommends deep nasal breathing to relax. "This directs air into the lower lobes of the lungs where there are a greater number of parasympathetic nervous system receptors—stimulating repair and recovery while calming the mind," he says. Inhale and exhale deeply from the nose, spending five to eight seconds on each inhale and five to eight seconds on each exhale.
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.
Stand in front of the bar, shins touching metal, feet roughly shoulder-width apart. Squat down and grab the bar overhand, hands slightly wider than shoulder width and elbows straight. Draw your shoulders back, push your chest out, and tense your lats. Taking a deep breath, begin standing up, pushing heels into the ground and pulling your chest up. Keep the bar as close to your legs as possible. As soon as the bar passes your knees, push your hips forward with power, ending standing tall and straight with the bar in front of your groin. Slowly reverse the motion, making sure to keep your abs braced, and lower the bar to the floor.