Heat training notes

For power-meter riders training (and racing) in real heat — not beginner hydration tips.

What heat usually changes

Same watts usually cost more. Heart rate up. RPE up. Durability down. Sleep and next-day readiness often take a bigger hit than the ride file shows. How much depends on the athlete — sometimes it’s mild, sometimes it’s ugly.

You can “hit the numbers” and still trash the week if every session turns into a death march. You can also feel awful on the porch and still nail the work. Feelings lie in both directions. The power target is the honest signal.

Don’t hide from it

If you race in the heat, train in the heat. Shade isn’t a plan on a bike — cover moves, wind moves, the route changes. Get out in the elements and learn to deal with them. You will get stronger. Heat becomes less of a problem as fitness and familiarity come up.

The goal is not to avoid hard days in the weather. The goal is to keep the quality of the work honest while you’re out there.

How to run key sessions in heat

Go start the session. Don’t pre-judge from how you feel.

Keep the prescribed power. Do not quietly lower the watt target because it’s hot. You get faster by doing work at higher power. Softening the target turns the session into something else.

Let failure cut the volume — not the watts.

What counts as a failure: you can’t hold the given wattage for the given interval time.

Failure rule (example)

Prescription: 10×30 seconds @ 500 W, about a minute rest.

• Hit 500 for the full 30s until you can’t.
• First failure → stop that set.
• Optional: take one longer reset (~5 minutes), then continue at the same target.
• Second failure → intervals are done for the day. Cool down. Protect the rest of the week.

Same logic for other high-power work: target stays; number of intervals shortens when you fail.

There’s little benefit in grinding more reps when you’re not holding the watts for the full interval. That’s not “mental toughness.” It’s junk work. Stopping keeps the stimulus clean.

Setup that helps (without dodging race reality)

For a key / quality session in the week:

• Start earlier, or
• Do the hard one indoors when you need a controlled hit

Still get plenty of outdoor heat exposure across the week. You’re not building a greenhouse athlete — you’re choosing when the precision work needs a cleaner environment.

Filler rides can bend. Key work keeps the watts.

One-week rule of thumb

Protect 1–2 quality sessions. Everything else can move for heat, sleep, and life. When the hard work is done, stop digging.