So I have noticed a considerable amount of guys in my gym will not do any leg work(as much as 50% on some days).... All they do is bench and do bicep curls... Why don't a lot of guys wanna do leg work?
Many reasons, primarily because leg muscles aren't as visible and often not considered as important aestetically. This is the same reason people don't workout their back enough. Of course, in the long run, doing arms and chest will make you look silly and it will be obvious that you aren't really strong.
Some people also think that because they ride their bike to work/to the gym, they don't need to workout their legs. This is not true.
I think there's many reasons:
- Some likely do leg work but perhaps run a split routine and leg day is a day you're not in the gym.
- Some may do a leg intensive sport and working the upper body in the gym is a way to compensate
- On the other hand some may do an upper body intensive sport and so legs just aren't a goal for them
- Finally there will be some people who don't care about or enjoy training legs.
In the end though it doesn't really matter, provided you are happy with what you are doing in the gym I wouldn't worry about deficiencies in other people's exercise.