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  • I use intervals.icu to chart fitness, TSS, freshness etc. With enough data it does a very accurate job of estimating TSS from heart rate in outdoor rides with no power meter. I’ve also been swimming this week while on holiday, want to have a vague idea of TSS from that to see how it affects my recovery week - so far so good on that front too. Grabs all its data from strava so I’ve been manually adding swims.

  • Doesn’t seem that complex. Work out your minutes per 100m pace (various methods online, 400m + 200m TT etc), set it in intervals.icu then add your activity on strava. Intervals works out the TSS and adds it to your graph.

    I guess using an HRM while swimming would be even better.

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