Want to tone your stomach, legs and arms in just a few minutes a day? The plank will do all these things. This move is a highly effective way to work multiple muscle groups at once. It not only tones your abs but strengthens your back extensors, quads, glutes, upper back, shoulders and arms.
It also improves posture because it strengthens the main muscles around your spine, and helps with intermuscular co-ordination, meaning better synchronisation between muscle groups.
Although the plank may look easy, it is commonly performed incorrectly, which can cause the wrong muscle groups to engage.