Ok my dad bought a bowflex so I use that to work out. I'm being doing it every other day for like a week and a half and I stretch every time after. Recently, I've got what feels like a tightness when I stretch my arms out (like when I stretch my arms after waking up/stretch them to the top or side in general) and it sorta feels like its warm (but only while I'm stretching). I was wondering if that was normal.