Groupon has the Sivan Adjustable-Back Balance-Ball Chair with Ball and Pump on sale for $89.99 + FREE shipping!

Why this deal is hot:
Save 40% off -- that's $60.00 in savings!

What this does and why you need it:
This office chair helps to correct posture, improve circulation and reduce stiffness. It prevents spine disorders and enhances physical rehabilitation. It features an adjustable back, has a rolling base with 4 wheels, 2 locking wheels and includes the pump and ball. It measures 25" x 23" x 33" and weighs just 15.50 pounds.