The first recorded running event was held way back in ... a mostly normal conversation while you go – if you can't, you're going too fast." Stephen Vrska, a marathon and ultra runner from ...

Want to know how fast you could run a half marathon, for instance, based on your current training volume? Use our simple race time predictor below to calculate your estimated finish time.

Some coaches caveat that advice with the fact that you can only run very slowly if you also run very fast. Kim Clark, aka Trackbabe, a run coach and influencer, previously told Stylist that most ...