To do it: Start with feet in a wide stance, knees bent, arms up on guard. Keeping your lower body still, quickly lean your upper body to the right, then come back through the center and lean to the left. Repeat lean back to the right. Next, lower your upper body, from the right around to the left side, making a half circle with your torso. Return to start position. That’s one rep. (Tip: it helps to keep a steady rhythm with this move, think—or say aloud—1, 2, 3, weave to help you keep your tempo). Repeat 10 times total, alternating starting on the right and left sides. 

In regards to weight training, use mainly compound exercises in your routine. Compound exercises involve movement at more than one joint and involve mainly major muscle groups. Bench press, squats, and dumbbell rows are all examples of compound exercises. These types of exercises stimulate more muscle fibers than isolation exercises and are more metabolically demanding.

A University of Southern Maine study found that a single set of a weight-training exercise torches as many calories as running at a 6-minute-mile pace for the same amount of time. So for every second you spend lifting weights, your body is expending high amounts of energy. Add high intensity interval training (HIIT) principles to your workout, and you could see even more gains.
Most men perform the inchworm as a warmup exercise. The move stretches your calves, hamstrings, and thighs, while preparing your muscles for just about any activity. But throw a towel under your feet while you do it, and suddenly the inchworm becomes a grueling core-strengthening move called the inchworm slide. "Sliding the towel to meet your stationary hands activates your abs, hip flexors, and obliques," says Jack. "You'll finish feeling stronger and loose."
To do it: Stand with your feet planted 3-4 feet apart, toes slightly turned out, hands on your hips. Lower into a plie by bending your knees out over your toes and lowering your hips directly underneath your shoulders. Then, as your straighten back up, slowly lift the right knee up towards the right shoulder. As you go back into the plie, slowly return the foot to the floor. Be sure to move at a very controlled pace to really engage the obliques the entire time—on the way up and on the way down. Do 10 repetitions on the right side, then another 10 repetitions on the left side for a total of 20.

best ways to build core

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