Well lack of equipment is an issue, but it is not a dead end issue, you can build good strength and add some size with little equipment.
1st make sure u understand something, if want to grow you gotta EAT, EAT, and Eat some more. At 6’1 and 180lbs ur a little light for your height.
–Now by eating I am not talking about muffins, cereals, doughnuts, and the like. That�??s not food. I will let people who know more than I do explain this. Here read this 2 part article by CT, its Fucking awesome:
http://www.T-Nation.com/readArticle.do?id=1793585
http://www.T-Nation.com/readArticle.do?id=1795045
(now you don’t have to take a bullshit nutrition class at college, you don’t need to throw money away)
Now let�??s talk training. As other have said you gotta train your back and legs too. So here is what you can do:
-Push ups and variations (feet elevated, one arm pushups, palms close, palms separated, etc)
-Dips. To add resistance put on a backpack fill it with your dumbbells and do dips.
-Pull ups/Chin ups (probably the best thing u can do for overall back and upper body strenght). Add the following variations:
http://www.T-Nation.com/readArticle.do?id=459572
(awesome pull up article)
–To increase resistance again put on the heavy backpack.
-Squats. But please, get deep on those squats, if don’t have the flexibility then check the 1st 15 minutes of this:
http://video.google.com/videoplay?docid=-6529481301858251744&q=dan+john&total=8786&start=0&num=10&so=0&type=search&plindex=0
(Dan John shows how to squat and later the O’lifts. This is how I learned to squat right)
–If you need weight do goblet squats with the dumbells like Dan shows. Also you can put all of them in a backpack, hold the backpack with your arms in front of ur chest and SQUAT!
-Throw heavy stuff around! I am not joking, if u got a back yard or a park nearby grab a heavy rock throw it, run after it, and throw it again. The next day you will “feel” what I am talking about
-And use the dumbbell for your arm and shoulders and stuff.
Additional Recommended Equipment:
CHALK! its like $1.50. (gloves are too expensive, they break easely, and they give u soft “city hands”)
my2cents