difficult out of context and some have me stumped but here are a few including some guesses
MWF probably = Monday, Wednesday Friday
PNF = Proprioceptive Neuromuscular Facilitation stretching
ATG = Ass To Ground as in depth of squat
ROM = Range Of Motion
SE = Speed / Special Endurance
WTS = Wednesday Thursday Saturday/ Sunday ? 
BF = Body Fat
PT = Personal Trainer
DL = Dead Lift or Defensive Lineman