Long Course Pool Swim: 2km Continuous Endurance Set

Session Overview

This 60-minute pool session builds toward a continuous 2km swim — the key endurance benchmark for Olympic distance triathlon preparation. By holding a steady aerobic pace for the full distance, you develop the mental toughness, stroke efficiency and cardiovascular fitness needed to exit the water feeling strong.

What You’ll Need

• Pool access (50m or 25m)
• Swim watch or poolside clock
• Swimming cap and goggles
• Optional: pull buoy for technique focus in warm-up

Warm-Up (10 minutes)

400m easy freestyle, deliberately slow. Focus on breathing pattern — establish your rhythm before the main set. Use the first 200m to find your stroke count and settle into the water. Last 100m of warm-up, build to your intended main set pace.

Main Set

2,000m continuous freestyle swim at a steady aerobic pace. Aim for RPE 5–6 out of 10 — you should feel like you are working but could maintain this effort for much longer if needed. Target negative splits: aim for the second kilometre to be 5–10 seconds faster than the first.

• Pace: 10–15% slower than your CSS (Critical Swim Speed) pace
• Stroke rate: keep it consistent — count strokes per length to monitor fatigue
• Breathing: bilateral every 3 strokes if possible, or your preferred pattern
• Mental checkpoints: break it into 4 x 500m blocks in your head

Cool-Down (5 minutes)

200m very easy backstroke or breaststroke to flush out the lactic acid and bring your heart rate down. Spend 5 minutes stretching your shoulders, chest and lats poolside.

Coaching Notes

• First goal: complete the 2km without stopping — pace is secondary to this milestone
• If you need to stop, take 20 seconds, then continue — do not abandon the effort
• Common mistake: starting too fast in the first 400m when adrenaline is high
• Scale down: complete 1,500m continuous if 2km feels too ambitious right now
• Scale up: add a set of 4 x 100m at CSS pace after the main set for advanced swimmers