Keep your chin away from your chest and gaze slightly forward, because dropping your head too far back can strain your neck, say Seki.

Lift your chest up so your shoulder blades are just barely touching the floor-if you're not lifted high enough, your upper abs won't be as engaged as they should be.

Also it increases the likelihood that youвЂ™ll pull on your neck.' If you find yourself pulling on your neck, don't interlace your fingers. 'Closing your elbows can decrease the range of motion during the twisting movement, which decreases the engagement of your obliques.

'Place your fingers lightly on the back of your head with your elbows open wide,' he says.

'This ensures you properly engage your quads and transverse abdominus,' says Seki.

Lie on your back with your heels out in front of you and your knees bent at a 90-degree angle (so your heels aren't close in to your glutes).

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If the bicycle crunch is difficult for you, begin by doing oblique crunches. If you find yourself straining with your head and neck to get your elbow to contact your knee, just rotation as far as you can with your torso. Make your torso do the work of rotation by not pulling your head forward. Your legs should be driving straight forward and backward. A variety of core and abdominal exercises ensures you are engaging your muscles in different ways. It is a key component of good performance in sports. Core and Abdominal Exercises for Strong CoreДЄ strong core will help you perform well at your daily tasks.

Bicycle crunch