hair? no. in fact working out regularly can damage it cos in my case i had long hair, pulled it back in a ponytail every workout, then pullin it out daily and the constant washing and hair drying etc caused my hair to split.
that said, exercising regularly is something i swear by and have done for the past ten years. i had been sedentary before that and felt s**t and fat and lethargic, and have changed my whole body which is now lean and toned. any 'puppy fat' i had on me is long gone, my face looks thinner as well. it changes your whole appearance. i eat what i want within moderation, i do not diet. i am tall but a size 10-12, and i am perfectly happy with my body now apart from maybe wishin i had bigger t*ts.
for skin, if you sweat, this can break you out as sweat releases toxins that can cause spots. sometimes i get huge ones on my chest and back, areas i cant get a towel to quickly, so, bring a towel with u if you sweat, and wipe it off regularly least on your face where spots are most unsightly.
mainly, u will feel FAR better, not just physically but emotionally if you exercise regularly. you will be more resistant to bad colds, u will have more energy (unless u have depression or any other illness), u will just feel better. u will carry yourself better, people will notice this. you come off as more confident as well. it also keeps you looking younger. i have a boxing teacher who is 43 and she looks about 33.
for the first few years exercise gives you a high. but if youve done it as long as i have u dont get the high anymore but it can still help ward off lows. i do it now to maintain my fitness.
its always better to exercise than not.
hope that helps.