Heat acclimation for spring races: a 14-day plan for serious athletes

Most athletes lose race pace in warm conditions because they treat heat like bad luck instead of a trainable stressor.

A simple 14-day approach works well: 5-6 short heat exposures in week one, then 4-5 in week two while keeping key sessions controlled. Start with easy runs in warmer hours or post-run sauna blocks of 15-25 minutes.

Use data, not ego. If heart-rate drift climbs too fast at easy pace, reduce intensity and keep exposure short. If recovery and sleep remain stable, progress duration before adding intensity.

Practical example: athlete targeting a spring half marathon keeps one threshold session, one race-pace session, and adds four low-intensity heat exposures weekly. Performance holds while heat tolerance improves.

At CoachUpFit, we combine Garmin recovery trends and Strava load context to individualize heat work so athletes arrive race-ready, not overheated.