Core muscle strengthening and giving yourself time off the bike and/or a bad position on the bike. Saddle angle? Go see a physiotherapist, could be sciatica. Try a different bike to see if it improves. Get a good mattress.
@sawfish started
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Core muscle strengthening and giving yourself time off the bike and/or a bad position on the bike. Saddle angle? Go see a physiotherapist, could be sciatica. Try a different bike to see if it improves. Get a good mattress.