Hi,
I also was very active b/f my LT. My TP team would always remind me that I have had a MAJOR surgery and my body is going to take time to heal. So your body is telling u that it’s not ready to be where u were pre TP. I am almost 2yrs LT and I am now back to exercising my pre LT and more. Some days my body will tell me u need to slow down take a day off. So in short try and be patient, listen to your body and I bet in no time u will be back to where u were and more.
Hang in there!!!