I mean physically…
A lot of people confuse “stiffness” for “stability” in the fitness world. When asked for exercises to create a stable foundation, most people think of exercises similar to a plank. 
Planks are a great start, but being able to hold a plank is just creating stiffness. Stiffness is great (insert joke here). We need stiffness for things like  impact control (landing/catching) and deceleration.

But a good definition for stability is demonstrating the ability to hold strong and adapt to changing positions and environment.

The comparison would be a plank (stiffness) to a bear crawl (stability). So make sure you are adding all elements to your stability work.

Ask one of our trainers to show you some appropriate and challenging stability exercises the next time you are in.