I'm 180lbs and looking to stay that way at 6'1". So I'm not big but I'm fit (If I spent 3 years and got big I'd have to quit going to my favorite caves and rock climbing might be a bitch. Plus I like my current kayak and snowboard). I had free gym access and now I don't so I'm considering doing this at home. I received a crap ton of dumbbells from a relative and an adjustable bench. The dumbbell pairs range from 20lbs to 80lbs and he made perfectly balanced (Was an engineer and was bored) 100, 120 and 140lb dumbbells. No barbell and I was wondering will squats and deadlifts be as effective with these weights as with my previous barbell exercises, assuming it's similar weights? Are there any downsides to an all dumbbell routine? I know it's alright for most exercises but what about compound ones? If I just want to maintain my current weight and strength and some of the exercises I listed won't be as effective, are there any substitute ones that you can do with heavy dumbbells that could supplement these? Thanks.