Triathlon Field Test Day: Swim CSS, Bike FTP and Run Threshold in One Day

Session Overview

A field test day benchmarks all three disciplines in a single day so your training zones are reset against current fitness rather than numbers from three months ago. It’s a big day — space the three tests out with proper recovery between them, and treat this as a standalone testing block rather than something you slot into a normal training week.

What You’ll Need

• Pool access for the swim test (or open water with accurately measured distance)
• A power meter or smart trainer for the bike test
• A flat, accurately measured or GPS-tracked route for the run test
• A way to record splits for all three — GPS watch, stopwatch, or bike computer

Warm-Up (15 minutes per discipline)

Warm up properly before each individual test rather than once for the whole day — 15 minutes easy building to moderate effort, with 3-4 short accelerations toward the end to open the legs (or arms, for the swim) up to race-effort intensity.

Main Set

Run the three tests in this order, with a minimum of 3-4 hours’ recovery between each — ideally swim and bike in the same morning session with a rest break, and run either later that day or the following day if you’re not fully recovered.

• Swim CSS test: 400m time trial, 10 minutes easy recovery, then 200m time trial. Critical Swim Speed is calculated from the pace difference between the two — this gives you your threshold swim pace for setting future interval sessions.
• Bike FTP test: a 20-minute all-out time trial effort (or a ramp test if your trainer supports one) after a full warm-up. Take 95% of your 20-minute average power as your estimated FTP.
• Run threshold test: a 20-30 minute time trial on flat, accurately measured ground at the hardest sustainable pace you can hold for the full duration. Your average pace across the effort is your current threshold run pace.

Cool-Down (10 minutes per discipline)

Easy effort after each test — don’t skip this just because the test itself was short. Ten minutes of easy swimming, spinning or jogging helps clear the legs before you head into the next discipline’s test later in the day.

Coaching Notes

• Pacing discipline matters more than raw effort — going out too hard on any of the three tests skews the number you’ll be training off for the next 6-8 weeks.
• If you’re not fully recovered from the swim and bike, push the run test to the next day rather than testing on tired legs — a threshold run number taken on fatigued legs will underestimate your real fitness.
• Retest every 6-8 weeks through a training block, always in the same conditions (same pool, similar weather, similar time of day) so the comparison is meaningful.
• Scaling: if a full test day feels like too much, split it across a full week instead — one test every 2-3 days — rather than skipping tests altogether.