Turbo Muscular Endurance: 3×20-Minute Tempo Blocks

Session Overview

This 75-minute turbo trainer session uses three 20-minute tempo blocks at 76–88% FTP to build the sustained power output you need on the bike leg. Muscular endurance is the cornerstone of strong triathlon cycling — this session trains your legs to hold steady effort over long periods without fading.

What You’ll Need

• Turbo trainer or smart trainer
• Power meter or trainer power data
• Heart rate monitor (optional but useful)
• Fan for cooling
• Water and nutrition (especially in the second half)

Warm-Up (10 minutes)

Start with 5 minutes easy at 50–55% FTP (Zone 1), then gradually build to 65% FTP over the next 5 minutes. Include 3 x 20-second accelerations up to 85% FTP with 1 minute easy recovery between each to prime your neuromuscular system.

Main Set

Complete three 20-minute tempo blocks at 76–88% FTP (Zone 3), with 5 minutes easy recovery spinning at 50–55% FTP between each block. Target a cadence of 85–95rpm throughout the effort blocks.

• Block 1: 20 minutes at 76–82% FTP — settle into rhythm, focus on smooth pedalling
• 5 minutes easy recovery at 50–55% FTP
• Block 2: 20 minutes at 80–85% FTP — increase pressure slightly, maintain cadence
• 5 minutes easy recovery at 50–55% FTP
• Block 3: 20 minutes at 82–88% FTP — push to the top of the zone while holding form

Cool-Down (5 minutes)

Spin easily at 50% FTP or below for 5 minutes with a slightly higher cadence (95–100rpm) to flush the legs. This active recovery helps clear lactate and reduces post-session muscle stiffness.

Coaching Notes

• Keep your upper body still and relaxed — tension in the shoulders is wasted energy
• If you don’t have FTP data, target an RPE of 6–7/10 for the effort blocks
• To make this harder, reduce recovery intervals to 3 minutes or add a 4th block
• Heart rate will naturally drift upward through each block — this is normal and expected