@Pierre Great questions.
For heart rate, sleep and recovery I have found it to be quite accurate. I never liked sleeping with my Garmin watch due to the size of it. Wearing The Whoop does take a little getting used to but it is a much lower profile and thus less obtrusive when sleeping.
Earlier I posted that I rely on my Wahoo Tickr synced to my Wahoo Element Bolt as the chest strap was always more accurate and I am so dialed into speed and distance. That said, I did review the HR data Whoop captured on my weekend rides and it does a much better job than my old Garmin watch at catching the HR spikes. Probably because it reads HR 100 times per second. Still, the HR strap is my “official” that goes into Training Peaks.
I think it will be pretty reliable for The Sufferfest sessions. I find my strength sessions from The Sufferfest do not add significantly to my day strain. The Whoop has a real time Strain Coach that you can start when you start a work out so you can watch the strain build to whatever the daily recommendation is. I did that this morning on “The Trick” to make sure I did over-drive my day strain.
I think it measures “life” well. I have been experiencing quite a bit of job stress the last couple months and I now really see the connection between mind and body. The stress took its toll on my recovery mainly through disrupted sleep. Happy to report the issue has come to a successful conclusion but SOMEONE owes me a couple of months of sleep.
I can say the “recovery” number in the morning correlates well to how I feel. I can still go out and do an aggressive ride with a low recovery score, but it will put me further into a hole the next day. I will feel it.
I have not really put any effort into the calorie burn evaluation yet. Just a casual review makes me think it reports a higher burn than actual. Probably my next eval now that the work stress is dealt with.
Good luck and please don’t hesitate to ask any other questions.
My question is why are you transitioning away from triathlon and more to just cycling?