god damn ithttp://www.quickanddirtytips.com/he...-ways-increase-testosterone-exercise?page=all
http://www.chadhowsefitness.com/blog/2010/05/5-testosterone-boosting-exercises/
Those are just the first couple that came up but this should give enough insight. Like Omar said you wanna go for overall strength to prevent injury, isolation is ok but just on certain days.
I made the same mistake before when I first hit the weight room. I was lifting crazy on curls but never worked back and ended up pulling muscles in my back.
Trust me back problem is the last thing you want
now youre going to make me do back in the gym
give me some exercises fukk!!!