I'm a skinny guy -- don't need to lose weight, never have had to. But recently, I've decided to put on some muscle.
I've been working out for about 3 months now. I hate going to gyms, so I bought some dumbbells and a pull-up bar that attaches onto any standard door frame. I also have an exercise bicycle machine that I've had sitting around for years, but have never taken advantage of.
I mainly focus on pull ups; I do 3 sets daily, since they work out most of the upper body. The rest of my exercises I perform sporadically, so my body doesn't get into a standard routine. I use dumbbells mainly to target my triceps and shoulder muscles. I also do small 45 minute sessions on the exercise bicycle machine every few days (cardio isn't my priority).
I'm not really looking for advice. I think I found what works for me -- have already noticed some improvement. Just thought I'd share.