Give it a gentle bounce. Does it spring back? Excellent. Now, please, for the love of all that is wobbly, sit on it. Yes, right now. Feel how it forces your core to engage? That’s the magic.
If it feels too squishy, let a tiny bit of air out (press the pin inside the plug). Too bouncy? You can add a few more pumps. You are now the master of your bouncy universe.
That saggy blob you started with is now a throne of instability, a tool for laughter, and a secret weapon for better sitting posture. You did that. With your own two hands and a silly little pump.
How To Pump Up A Fitness Ball: Your Quick & Easy Guide