Bodybuilding isn't just about becoming a massive humanisaurus. It's also about being beautiful on the inside, being a good person and doing a lot of charity work. Okay it's totally not, but what is also important is detail and symmetry. Symmetry is something that is often neglected by bodybuilders and not even considered until a problem emerges. This is a big problem for professionals as however big they get the judges will penalize them if they look lopsided.
Even for non-professional bodybuilders this can become a problem as you'll eventually find that you can't do the same amount of reps with each arm on many exercises. Soon your weak arm will become to look withered and pathetic. People who pass in the street will stare at you. Sometimes they'll spit. Something needs to be done!
As ever prevention is better than cure. Using the following methods you can make sure that your body develops equally stopping you from ever becoming a freak.
Train your weaker side first For unilateral exercises (such as bicep curls or bent over rows) you should always train your weaker side first. Doing even a single rep taxes energy meaning that you can't put the same amount of effort into the second half of the rep. By training the weaker arm first it will get a marginally better workout and this should help it slowly gain on the other arm.
Become ambidextrous It's not as hard as it sounds and just writing a few paragraphs with your weaker hand can show improvement within a few weeks, and just a it of improvement can have a positive impact. This has countless benefits but in regards to bodybuilding it will help with your coordination and so your form when exercising. It's also important that you use both arms for daily tasks. Got a bag of heavy shopping? Try changing hands from time to time (if you're insane like me you can also do little shrugs).
Use dumbbells For exercises such as the bench press it's possible that you can get by using one arm more than the other. By switching the bar for two dumbbells however you're forced to you use each side equally. The same is possible for shoulder presses,
Play Catchup Desperate times call for desperate measures, and in extreme cases (such as after an illness, or if you're just really weird and lopsided) it can be worth only training the lagging side for a while. If it's biceps you have problem with for example, it might be worth just training the one arm. This obviously will fix the problem twice as quickly as one arm grows and the other stops growing. Once they are even again you can't start training normally... and this time get it right..
