The thing you have to remember is not to panic. This is a common occurrence and one that will remedy itself over time. Remember to be patient and to continue training as usual and this slight problem will usually even itself out in a couple of months.
This phenomenon usually occurs for those aspiring weight trainers who are just starting out and one that is quite common in the weight training world. The way I look at it, some parts of your body are more adept to strength and coordination because of body preference.
For example, when I first started out training, my left arm was always stronger than my right. It was also bigger by about a half an inch. It didn't matter if I was curling a barbell or bench pressing, my left arm was always to one to power through the movement. My right arm was always the first to give out.
For awhile, I didn't know what to think and I was getting very frustrated with the whole thing. After thinking about it for awhile, I came to realize that my right arm didn't have the experience that my left arm did. That is, when I was growing up, I used my left arm for just about everything. From playing hockey to throwing a ball, it was my left arm that did most of the work.
So, it was only natural that my body depended on the strongest arm to power through a lot of my upper body movements.
The same can be said for most of your muscle groups. You may find that your right leg is stronger than your left or your left shoulder is stronger in pressing movements than your right. You may also notice that some muscle groups are larger than their corresponding muscle partners such as the left and right biceps.
The thing you have to remember is that this is only a temporary thing. Over time, your weak body part will have no choice but to become stronger and more coordinated. It will grow, to match that of your stronger side.
However, if you don't want to wait a couple of months, you can do some extra work for your weak muscle group. For example, let's say your left pec is bigger than your right and you want to correct that problem sooner than later. In this case, you may want to do a little extra work for the left pec. Let's say you're doing dumbbell bench presses for 3 sets of 10. On your last two sets, you might want to do an extra rep or two for your right pec.
The same can be done for most of your exercises such as biceps curls, leg presses, dumbbell shoulder press and other exercises. Just remember to add an extra rep or two for your weak body part and you should see an improvement in a couple of weeks or so.
Remember, this is not a permanent thing and one that will remedy itself in a couple of months. Keep on doing what you're doing and be patient.
Good luck and all the best,
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