Arguably the most feared of all disciplines in the pool, Mark Foster imparts some expert advice on how to smash the butterfly stroke.

In this latest video from coach Abbie Fish, a focus is placed on butterfly breakouts, which can spark a swimmer to improved performances.

The butterfly stretch is popular for reducing tightness in the inner thigh due to muscle overuse or compensation for the hip flexor.

Butterfly is a difficult stroke to swim as it needs both stamina and style. The movements you need to make, however, are not difficult because you will have done many of them before in other strokes.

Why not this?’” Durell only learned how to swim butterfly at age 68 so he could do IM races, but he celebrated his 69th birthday by doing his first 1650 butterfly.