Manhattan 462181 Foot Rest/Rocker, Under-Desk Comfort and Productivity Enhancer,

Rock your working world - this rocking footrest helps you be more comfortable and productive at your desk
The Ergonomic Foot Rocker from Manhattan lets you elevate, move and stretch your legs so you can work in greater comfort by improving your posture. Ideal for the home office and all jobs that require you to sit for long periods, this foot rocker reduces soreness and fatigue in your legs, feet and knees. You may like this rocking footrest so much that you also use it after work while sitting in your favorite chair at home.

Improve blood circulation while sitting
The rocking feature of this foot rocker lets you exercise your feet back and forth, so you can stretch your ankles and calves. Its reversible design lets you flip it over to use either side for quick or long rocking motions. It's just the right size at 277 x 502 mm (11 x 20 in.), so it's big enough for you to comfortably place your feet yet small enough to easily fit under your desk.

Non-slip surface
The textured platform surface prevents your feet from slipping, whether they’re in socks, shoes or barefoot. You don’t need to assemble any parts or use any tools since this cost-effective workspace addition is ready to use out of the box.