Apple health

Hi all, I just got myself an Apple Watch having moved from Polar for my activity tracking. I linked Apple health to Cronometer today & did not tick backfill.

I’ve just looked on Cronometer to check my numbers so far this week & Apple health data has been added to every day going back to Nov 2022 🙈 This means every entry from Nov is now wrong because my Polar watch added the daily activity, now it is (semi) duplicated with Apple health data presumably for my phone.

Is there a way to delete it all without manually going into every day? I don’t know why it has been added, I just want the data from today going forwards, not historical 😩