(Article from pumpsandiron.com)
15-Minute HIIT Workout
6-lb medicine ball
Gymboss Interval Timer
Set an interval timer for 15 rounds of 45 seconds of work and 15 seconds of rest. You’ll go through the following exercises 3 times. This workout will get you sweaty and out of breath, focusing especially on the core.
Power Wheel Ab Roll Outs:
Get on your knees and hold the power wheel centered on the ground. Your arms are going to stay straight throughout this. Slowly extend your arms, rolling the wheel out as far as you can go, lowering your torso. When you’ve extended as far as you can, slowly roll back to starting point. You’ll want to keep your butt down during these—think of your back, butt and hamstrings as one straight line. Try not to stick your butt up (I know it’s tempting on that tough roll-in).
Start with kettlebell on the floor between your legs and lift it up to starting position with both hands, flat back, using your legs to lift. With kettlebell hanging between your legs, use your arms as a pendulum, and swing the bell to chest-to-eye level by thrusting with your hips while keeping your core tight as you stand up straight. Swing back down and repeat. Your knees should remain slightly bent, but the main source of movement is hinging at the hips—not so much squatting. I use a 25-lb bell.
Med Ball Sit ‘n Toss:
Lay on your back with arms stretched overhead, holding on to your medicine ball (it should be hovering a couple inches off the ground—don’t let it rest on the floor). Lift the medicine ball forward as you sit up, keeping arms straight, and lift it straight above your head as your body comes into upright sitting position. Bring ball into chest and toss up into the air. Catch and slowly lower to the ground, bringing ball back overhead behind you.
Stability Ball Prone Oblique Twists:
Get into a plank with your shins on a stability ball and your hands on the floor, directly under your shoulders. Draw your knees into your right shoulder, keeping feet on the stability ball, and then return to center. Repeat to the left.