Swim-Run Intervals: 6 Rounds of 200m Swim and 500m Run

Session Overview

This advanced 60-minute session combines pool and track work into six back-to-back rounds of 200m swimming and 500m running. It builds the sport-specific fitness needed for aquathlon racing, sharpens your triathlon swim-to-run transitions, and conditions your body to switch between two aerobic disciplines under fatigue. You’ll need access to a pool and a running track or 500m flat loop nearby.

What You’ll Need

• Pool with clear lane access for the swim legs
• A 500m running loop within 100m of the pool exit (or outdoor track)
• Goggles, cap, and a trisuit or swimwear you can run in
• Running shoes at the pool exit for instant transition
• GPS watch to track pace on the runs

Warm-Up (8 minutes)

400m easy pool swim including 2 × 25m drill (catch-up or fingertip drag). Transition to your shoes and run 300m at easy Zone 2 pace to warm your legs. Then back to the pool to start round 1.

Main Set

6 × (200m swim + 500m run), with minimal transition time between swim and run each round. Allow 90 seconds rest between complete rounds (at the end of each 500m run). Target RPE 7–8 throughout — hard but sustainable across all 6 rounds.

• Rounds 1–2: Find your pace. Swim smooth, run controlled. These should feel manageable.
• Rounds 3–4: This is where the session gets honest. Your swim efficiency will drop — focus on maintaining stroke rate, not distance per stroke
• Rounds 5–6: Mental as much as physical. Keep your run form — arms driving, hips forward — even when your legs want to shuffle

Cool-Down (5 minutes)

200m easy backstroke in the pool to bring heart rate down, then 5 minutes of easy walking and dynamic stretching: hip flexor lunges, ankle rotations, and shoulder circles.

Coaching Notes

• Keep your transition between swim and run under 30 seconds — remove cap and goggles while walking, not standing still
• Run pace will naturally be 20–30 seconds/km slower than your standalone race pace — this is normal, not a failure
• To make easier: 4 rounds, or reduce to 300m swim + 400m run; to make harder: 8 rounds or tighten rest to 60 seconds
• This session suits aquathlon racers, triathlon swimmers who neglect run fitness, and anyone preparing for a swimrun event