Midrun selfies

Posting a mid-easy-run pic may connect you with the running community, says Hamilton, but pausing during tempo, race-pace or long runs can interfere with your fitness gains. ‘The purpose of these workouts is to maintain intensity over an extended period,’ says Warrenburg. ‘If you’re stopping in the middle, you’re changing the dynamic.’ And then there’s basic safety and etiquette: slamming on the brakes to whip out your phone in a crowd can cause a pileup.

INSTEAD Save midrun snaps for easy days, doublecheck that the coast is clear before you stop and ask permission before posting a group shot. ‘Just like in traffic, you should respect the people around you,’ says Hamilton.