Last updated: 3 August 2026
Reviewed by Jordan Morley, FA Level 2 Football Coach
Critical Swim Speed
Critical Swim Speed
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Top picks compared
| Pick | Product | Best for | |
|---|---|---|---|
| Top pick | Waterproof Swim Watch | Time your 400m and 200m trials accurately and track CSS over time. | Check price → |
| Option | Tempo Trainer Pro | In-cap beeper to hold your CSS pace precisely during threshold sets. | Check price → |
| Option | Swim Training Log Journal | Record time trials and CSS sets to chart your threshold improvement. | Check price → |
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Frequently asked questions
How do I use CSS in training?
Swim threshold sets at your CSS pace per 100m, do speed work faster than CSS, and easy/recovery swims slower. Re-test every few weeks to track improvement.