AST and ALT change all the time. Depending on circumstances, 2x normal isn't particularly notable. Also, strength training isn't necessarily the cause nor is it

AST and ALT change all the time. Depending on circumstances, 2x normal isn't particularly notable. Also, strength training isn't necessarily the cause nor is it something a doctor automatically, nor even commonly, flags for concern. The doctor should have asked you about changes in your daily routines, but you have to give them the benefit of the doubt. It's only the doctors job to find relevant data regarding your chief complaint. If they thought 2x changes were something to care about they would have followed up with you about that. Not to be impolite but only to make a point: if you read enough to be distressed, you could have read enough to de-distress yourself.