Lie on your back with your legs bent to a right angle over your chest.
Crunch Heel Touches
The first step is to lie on your back with your hands behind your head.
Crunch and Reach
Lie on your back with your arms stretched above and your knees bent so that your feet are flat on the floor.
Bicycle Crunch
The proper position is to lie face up on the floor with your legs extended in front of you and your backside pressed firmly into the ground.
Forearm Plank Walkouts
Tone It Up co-founders and personal trainers Dawn and Katrina Scott recommend this plank variant to their clients because of the added core stability it demands.
One Leg Plank
In a plank posture, you'll... Squeeze your glutes and press your toes onto the floor.
Mountain Climbers
Put your hands exactly beneath your shoulders and into a plank stance.
Starfish Crunch
Lie on the floor in a starfish position by spreading your arms and legs.
Straight-Leg Jackknife
Hold your breath and, as you let it out, tighten your abs and elevate your right leg.
Russian Twist
Sit up straight with your legs bent and your chest up. The lower you go, the more core engagement and straight spine maintenance you'll need.
The instruction is to get into a plank posture by resting your elbows on the Swiss ball and your toes on the floor.