| Left arm is officially "retarded"
I need some serious advice/insight on my left arm and doing the work-out on abs. Basically I just started to get back on track with the whole working out. I used to be serious on it but stopped 5 years ago. Now, when I lift dumbbell, sitting on the bench/chair, I can use 15LB at least, doing about 4 set at 10 reps each. However, it's whole different story on my left arm. I can barely break 3 set at 10 reps each with 10LB. This is the same when I stand doing the weight lifting with dumbbell, it's difficult to do perfect form lifting starting with second set. I need advice on what I can do to get my lift arm "unretarded" and get it back on track along with my right arm. Should I stop doing right arm for a while and focus on my left arms so that it would be strong in strength as my right arm is? Please give me some advices on this situation
Now on to the question about abs work-out. First question- is old fashion sit-up efficently or useful? it's the one with being laid on the floor with kneels up but feet on the floor, arms behind head and do sit up. If not, is it at least a little bit useful?
If so, here's my problem. Back when I was 14, (I'm 18 now), I was able to easily do 300 old fashion sit-ups (the one I described above) without too much difficult. Now I can barely break 30 sit-ups. How come? Is it because I was "slimer" back then, I have fat belly, not overweight but somewhat fat belly. Does this makes it difficult or is it just because I haven't done it forever? How should I start with the work out abs?
And last, should I eat before working out or after? I go to the gym in the morning.  | 
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