However, fast forward a couple days: many people find that their less dominant arm lags behind their body as they come up into the muscle up. Not only is this ugly, but it is also bad form. In addition, you risk injury to your rotator cuff and shoulder muscles when you put too much stress on a particular shoulder joint.
But really, it looks terrible
Well first you have to understand what’s going on. The reason your non-dominant arm is lagging behind is simply due to the fact that your muscles are weaker on that side. The muscle up requires a substantial deal of back and lat strength as well as significant coordination throughout your body. If the left side of your body is in unequal muscular development to your right or you are really uncoordinated with your non dominant side, then you will most likely find your arm lagging on your first muscle ups.
![Picture](/uploads/8/7/6/2/8762506/2881834.jpg)
In addition, here are some exercises you can work in to your routine to strengthen your non dominant side:
Archer Pull ups
One handed assisted pull ups
One handed negatives
One handed lat pull downs (with exercise bands)
After a month of consistently working muscle ups the problem should go away. Nevertheless, it may come back when you get tired, as it still does for me—my left side gives out at around 23 muscle ups.
If you haven’t gotten your first muscle up yet, keep practicing! If you use our tutorial, send us a video and we will feature you on our home page!