Sprint Swim: 50m Repeats for Triathlon Race Speed

Session Overview

This short, sharp 30-minute pool session develops raw swim speed through 50m sprint repeats. Sprint sets train your fast-twitch muscle fibres, increase stroke rate under effort, and build the explosive capacity to surge off the start or around buoys on race day. Short and intense, this session punches well above its time investment — perfect for busy triathletes who want to add a speed stimulus without committing to a long pool session.

What You’ll Need

• 25m or 50m pool
• Swim goggles
• Pull buoy (optional, for warm-up drill sets)
• Waterproof watch or poolside clock for timing rest intervals

Warm-Up (8 minutes)

300m easy freestyle at RPE 2-3, alternating 50m free / 50m backstroke to keep it relaxed and varied. Then 4 x 25m build: start each 25m very easy and arrive at the wall at RPE 7, 30 seconds rest. These builds prime your central nervous system for the sprint sets to follow without creating fatigue before you start.

Main Set

All sprint sets should be performed at maximum controlled effort — RPE 9 to 9.5. You are not pacing these; you are sprinting. Maintain technique under fatigue — if your stroke falls apart, rest longer before the next rep.

• 8 x 50m sprint, 45 seconds rest between each — focus on fast, controlled turnover from the first stroke off the wall
• 200m easy recovery swim at RPE 2, any stroke
• 4 x 50m sprint, 60 seconds rest — the longer rest means you should be going faster than in the first set. If you are slowing down, rest longer

Cool-Down (5 minutes)

200m very easy mixed stroke or backstroke, RPE 1. Focus on long, slow strokes and deep, controlled breathing. Sprint work elevates heart rate significantly — allow 5 full minutes to bring your heart rate below 100bpm before exiting the pool. Finish with shoulder rolls and arm circles poolside.

Coaching Notes

• Quality over quantity — if your times start slowing significantly between reps, extend the rest to 75 seconds rather than grinding out tired sprints.
• Focus on the first 15m of each 50m: explosive push-off, fast breakout, and high stroke rate from the first arm pull. This is where races are won and lost at the start buoy.
• Easier version: reduce to 6 x 50m in the first set, 3 x 50m in the second set. Keep rest the same.
• This session should leave you feeling pleasantly tired in your shoulders and lats, not exhausted. If you are wiped out afterwards, you are starting each sprint without sufficient rest.