What the “Pilates Shake” Actually Means for Building Lean Muscle

If you've ever taken a Pilates-inspired strength class, you've probably experienced it.

Your legs start trembling.

Your arms begin shaking.

Your core feels like it's vibrating.

And somewhere around the halfway point of the movement, you start wondering:

"Is this normal?"

Or maybe you've heard someone say:

"If you're shaking, you're building muscle."

Then someone else chimes in:

"Nope. That's just a Pilates thing."

So...who's right?

The answer is somewhere in the middle.