15 min as 15 on/ 15 off free

15 min sec hard effort free/15-sec easy freestyle.

Author: Tcrowley
Sport: swim
Duration: 15 min
Dominant zone: Threshold
Intensity: 0.73
Created: 2022-12-23T20:43:17.065Z
Updated: 2026-04-22T10:59:18.569Z

Structure

2 min @ 50-55% (50-55w)
26X
- 15 sec @ 100% (100w)
- Rest 15 sec @ 50% (50w)