Swap planks for five more functional core exercises, as cherry picked by a certified trainer

A man smiles and performs a side plank on an exercise mat at home. He is on his side, feet stacked one on top of the other, left forearm on the ground and body elevated. .

Ever since training for and completing the London marathon two years ago, Jess Pritchard has been left with a nagging feeling that's been hard to shift.

“What started as a small niggle in my lower back turned into a persistent issue day-to-day,” the certified trainer and group exercise instructor tells Fit&Well.