5. Allow for Acclimation
If you’re not used to running in the heat, don’t expect to set a personal best the first time you try. Instead, slow your pace down, decrease your distance and allow yourself to take breaks whenever needed.
Your best bet for hot-weather running is a shady trail with soft terrain, like Toronto’s Beltline Trail, or Collingwood Ontario’s Georgian Trail.
You can also allow your body including your joints to acclimatize by giving them a break. And do some cross training such as workout in the pool. Which is excellent for your ankles and knees and hips.