hardest workout

Buckingham does this long bike workout to prepare for Ironman, and practices everything during it.

The American pro will do this simple but demanding interval session once a week leading up to an Olympic-distance or 70.3 race.

This long, tough track workout was given to the Ironman Lake Placid champ as part of his training block with coach Raynard Tissink.

This bike session is a combination of low cadence/high resistance and high cadence/low resistance work.

The back-to-back Ironman champ uses this workout to prep for the Ironman marathon.

The 2013 Kona runner-up uses this cycling workout in his Ironman buildup.

The speedy ITU runner uses dynamic run training to become more efficient.

One of triathlon’s speediest swimmers—she led out of the water in Kona—uses this workout to kick off a big training block.

One of the sport’s fastest riders uses this interval session to get race-ready.