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.
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.