alright, im gonna use the word "burn" here and i hope to fuck i dont get flamed. i've been doing alot of prehab stuff lately, namely external rotations as well as some lateral and front raises (yeah yeah). 1st and 2nd set, yeah, i get that "burn" bullshit, but by the 3rd and 4th sets, that pain just seems to completely disappear and i feel NOTHING. now this is VERY strange to me, because the discomfort is usually constant up until very recently and now ive almost become immune to it. any explanation for this or is this normal?