2×30-Minute Sweet Spot Bike Session

Session Overview

Two sustained 30-minute efforts at sweet spot intensity (88–93% of FTP) are one of the most time-efficient ways to build cycling fitness for triathlon. This turbo session generates significant training stimulus with manageable recovery cost — making it a staple mid-week session for athletes who cannot afford 48–72 hours of recovery after every hard bike workout.

What You’ll Need

  • Smart turbo trainer or standard trainer with power meter
  • Cycling computer or GPS watch displaying power and cadence
  • Fan for cooling — essential for maintaining quality in the second block
  • Full water bottle — you will need it during the recovery between efforts
  • Optional: training app (Zwift, TrainerRoad, Rouvy) to make the session engaging

Warm-Up (10 minutes)

Spin easy for 10 minutes at 60–70% of FTP with a high cadence of 90–95 rpm. In the final 2 minutes, include 3 x 10-second surges at 110% FTP to prime your neuromuscular system. Recover fully between each surge before starting the main set.

Main Set

Complete two 30-minute blocks at 88–93% of FTP (sweet spot intensity), separated by 10 minutes of easy spinning at 55–60% FTP. Target a cadence of 85–90 rpm throughout — slightly lower than warm-up to shift emphasis onto muscular engagement. Without a power meter, aim for RPE 7–7.5: uncomfortable but sustainable, with speech reduced to short phrases.

  • Block 1: 30 minutes at 88–93% FTP (RPE 7–7.5)
  • Recovery: 10 minutes easy at 55–60% FTP — drink and eat if needed
  • Block 2: 30 minutes at 88–93% FTP — aim to match or marginally exceed Block 1 average power

Cool-Down (10 minutes)

Spin very easily for 10 minutes at 50–55% FTP. This is not optional — easy spinning accelerates lactate clearance and improves blood return from the legs, which is especially important if you plan a run session the same day or the following day.

Coaching Notes

  • If you do not know your FTP, use the RPE guide — it is a more reliable reference than an outdated FTP test number
  • Sweet spot should feel like “comfortably hard” — if you are gasping after 15 minutes, ease back 5–8% and rebuild
  • Beginners: reduce to 2 x 20 minutes at the same intensity with the same 10-minute recovery between efforts
  • Advanced: progress to 2 x 40 minutes once you can consistently complete this session without power fade in the second block

Training at your own risk. The information provided is for general guidance only and is not a substitute for professional medical advice. Please consult a doctor before starting any new exercise programme, especially if you have any pre-existing health conditions.