WHEN THE MERCURY hits 80, 90, or 100+ degrees, your usual morning jog, tempo workout or long slow run becomes a very different beast. At best, it’s slower, more challenging and pretty sweat-inducing (though not actually, you know, pretty); at worst, it becomes a kick-your-butt sufferfest of epic proportions that takes a while to recover from. But there are many things you can do to aim for that first option. Running in the heat is tough, there’s no getting away from it, but you can make the most of hot weather running if you plan it well. If you can avoid running in the worst heat of the day you absolutely should – but if you have no flexibility, having to head out to a race or a group run when the conditions are brutal, here’s how to survive it.