If you are having trouble with the forward lunge, not being able to hold enough resistance up, try this moment:

I almost always wear long sleeve. I play indoor soccer in it too. Helps soak away the sweat. Its only 15' here at the moment and I have my windows open. Not a breeze but it lets the hot air out so I can breath while working out :D

Ive do/done this without a shirt one and it doesnt bruise, but it does pull the arm hair.