A six-pack is top of the list when it comes to desirable body parts for men, yet the abs muscles often cause confusion when it comes to training. Here, we outline the science behind the six-pack and the best exercises for building yours.

Your six-pack is actually one sheet of muscle, called the rectus abdominis, which extends from your ribcage to your pubic bone. So any abs-specific exercise will work the entire area, but your rectus abdominis is supported by your external obliques, internal obliques and erector spinae. Together they support and manipulate your spine to form your 'core' - the muscular region that connects your upper and lower body. A strong core is vital for performing any dynamic movements in sport and for preventing back pain. So abs training is not just for show. It will make you stand taller and perform better in all areas of life.

Here's a selection of the best exercises for beginners to experts in building a rock-hard six-pack, plus variations so that you (and your muscles) don't get bored.