Well if you have been training BJJ for even just a few months, Chances are you have already developed muscle Imbalances in your hands and fingers.
You see, all that spider guard, grip fighting ,guard passing etc
puts a toll on our bodies.
It's those flexor muscles which are always being worked .....This creates imbalance between the muscle groups
But no need to worry, you only need to 'Balance them out' By exercising the opposing muscles