Aquabike Race Simulation: 1500m Swim into 40km Time Trial Bike

Session Overview

Aquabike — swim and bike only, no run — has its own pacing logic that’s easy to get wrong if you only ever train with a run leg in mind. Without a run to manage, both the swim and the bike can be raced closer to their genuine ceiling than a standard triathlon allows. This session simulates a full aquabike race effort: an Olympic-distance-style 1500m swim straight into a 40km time trial bike leg, with a real transition between them, so you can practise pacing both legs harder than triathlon habit usually allows.

What You’ll Need

• Open water venue (or a long pool session as a substitute if open water isn’t accessible)
• Wetsuit (if temperature and venue rules require)
• Bike set up as close to race configuration as possible, including any TT/aero bars you’ll race with
• A watch or bike computer to track effort and time

Warm-Up (10 minutes)

400-500m easy swimming including a few race-pace surges of 20-30 strokes to prime the system, followed by a short walk or jog to your bike to rehearse the transition sequence you’ll use on the day.

Main Set

The core of this session is racing both legs back to back at genuine race effort, with a real transition in between — the whole point is training the specific demand of aquabike pacing, not just banking swim and bike volume separately.

• 1500m open water swim at race effort — pace this closer to your genuine swim time-trial effort than you would in a standard triathlon, since there’s no run leg left to protect legs for. Sight regularly and practise your race-day line.
• Transition (target: under 3 minutes) — wetsuit off, helmet and shoes on, out onto the bike. Practise this exactly as you would race morning, including whatever nutrition you take on the move out of transition.
• 40km bike at sustained race effort — aim for a strong, sustainable 70.3-adjacent effort (roughly what you could hold for the full distance, not an all-out short effort) since aquabike pacing lets you commit more of your bike capacity than triathlon does. Break it into three roughly equal thirds mentally: settle in for the first third, hold steady through the middle third, and allow yourself to push in the final third if you have it.

Cool-Down (10 minutes)

Easy spin for 10 minutes at very low effort to flush the legs, followed by light stretching for the shoulders (post-swim) and hip flexors (post-bike aero position).

Coaching Notes

• The most common mistake is under-pacing the swim out of triathlon habit — if you’re not racing a run afterward, you can afford to swim closer to your real ceiling.
• Practise your specific nutrition plan for the bike leg in this session exactly as you’ll race it, since aquabike’s longer, harder bike effort often needs more fuelling than a standard triathlon bike leg.
• Scaling down: reduce to a 750m swim and 20km bike for a sprint-distance aquabike simulation.
• Target effort: swim at 95%+ of time-trial pace, bike at a strong sustainable effort you could describe as “hard but controlled” — RPE 7-8 out of 10 for the bulk of the ride, not an all-out 9-10.

See also: How to Train for Aquabike · Open Water Swim: Race Pace 1500m.