Open Water: 4×10-Minute Sustained Pace Session

Session Overview

This open water session replaces distance targets with timed efforts — four rounds of 10 minutes at a sustained race-specific pace — making it ideal for venues where precise distance measurement is difficult. It builds aerobic endurance and even-pacing discipline needed for triathlon swim legs of any distance.

What You’ll Need

• Open water venue (lake, reservoir, or sheltered sea)
• Wetsuit (if water temperature below 24°C)
• Safety tow float — mandatory for solo open water swimming
• Swim watch with water mode to track intervals
• Bright swim cap for visibility

Warm-Up (10 minutes)

Swim easily for 10 minutes at a relaxed effort, focusing on long strokes, bilateral breathing, and regular sighting every 8–10 strokes. Use the warm-up to orientate yourself to the venue’s buoy markers and conditions.

Main Set

Swim 4 rounds of 10 minutes at your target race pace — RPE 7 for sprint distance, RPE 6–7 for Olympic distance. Rest 2 minutes between each round (float and breathe, don’t exit the water). Use buoys or landmarks to track your route and measure consistency across reps.

• 4×10 minutes at race pace (RPE 6–7)
• 2 minutes easy floating recovery between efforts
• Sight every 6 strokes during intervals to simulate race habit
• Total swim time: ~50 minutes including rests

Cool-Down (5 minutes)

Swim 5 minutes very easy back to your entry point, focusing on breathing rhythm and slow, efficient strokes. Exit carefully and change promptly — core temperature drops quickly in open water.

Coaching Notes

• Always swim with a partner or near a supervised venue — never alone in open water
• Easier: reduce to 4×7 minutes or extend rests to 3 minutes
• Harder: reduce rest to 90 seconds or extend to 5×10 minutes
• Compare your pace per 100m across all four intervals — consistency wins races
• UK open water in late May can still be 12–15°C — check temperature before entering