Adventure athletes Hugo and Ross Turner, aka The Turner Twins, are well known for putting diets, fitness programmes and their own athletic performance under the microscope.

For their latest challenge, the twins tested whether doubling the amount of time you work out results in double the gains.

Over the course of three months, Hugo and Ross trained for 20 minutes and 40 minutes respectively. What they found may change the amount of time you’re willing to spend in the gym.