Alpha Brain Golden Ticket Sweepstakes -- Learn More
Alpha Brain Golden Ticket Sweepstakes -- Learn More
Learn More

Onnit Si Board

The ultimate balance training tool.

Onnit Si Board

Onnit Si Board

Onnit Si Board

  • The Ultimate balance training tool
  • Unique Multi-directional design
  • Helps with injury prevention

The Onnit Si Board is the most versatile balance training system available. The Si board is a multi-direction balance training tool that uniquely transfers weight from foot to foot for an absolutely free rotation and the ability to move in all directions. The heart of the balance training system is a solid urethane ball which helps with core control and functional movement that simulate the dynamic training that you need for sport. Engage more muscles as you try to stay upright. In addition to hard core balance training, using the system can help with injury prevention and overall body awareness.

Create 16 unique balance surfaces by combining Balls, Half Balls and Resistance Bands. Progress from basic to advanced skills and add complex training when ready. This is the perfect progressive tool for any user.

The Ball doubles as an unbreakable high rebound medicine ball. Slam the ball on the ground or off the wall for repetitive metabolic training, shoulder stability and reaction skills. The fast and high rebound easily allows you to complete complex full body moves unlike any other ball. These balls are designed to be slammed over and over again. The Si Board Ball is also great for trigger point and myofascial release. The hardness and smaller surface area will penetrate deep compared to a foam roller. For athletes with large and dense muscles these balls work exceptionally well.

The Si Board Ball doubles as an unbreakable medicine ball; get two products in one!

The Onnit Si Board comes with a free mobile app for iTunes and Google Play with instructional videos and pictures of exercises to help you get the most out of the training system.


Getting Started with Foundational Movements:

Being on the ball creates a challenge in all directions. Start your training by mastering the board movement in these combinations.

  1. Left and Right
  2. Forward and Backward
  3. Twisting
  4. Diagonal (combination of Twist and Left and Right)
  5. Clockwise and Counterclockwise
  6. Full 360 Degree Circles moving around the board

Top 10 Board Exercises:

The Si Board is a perfect well rounded training tool for full body coordination and strength. Take the foundational movements and apply them to any stance or position.

  1. Squat with Battle Ropes
  2. Ride Like Surfing, Snowboarding or Wakeboarding
  3. Squat reps with a Kettlebell hold
  4. Push Ups while twisting the board
  5. Dip position hold with one leg in the air
  6. Lunges with Steel Mace movement flow
  7. Yoga Planks and Back Bridges
  8. Kneeling on board with hands on ground for abdominal control
  9. Reverse Push Up with feet on the board and hands on the ground
  10. Bridge with feet on board and trunk on ground for back strength

Top 10 Ball Exercises:

The Si Board Ball is designed for repetitive slamming and high rebounds for complex movement training. For example, easily throw the ball into the air, let it bounce on the ground, squat underneath the rebound, catch and repeat the throw into the air. These exercises are unique to the Si Board ball and should be bounced off of solid concrete surface and walls.

  1. Powerful ground dribble
  2. Squat with chest press overhead thrust
  3. Slam, catch and hold parallel to ground for shoulder stability
  4. Slam to overhead catch for shoulder stability
  5. Chest pass against wall with side agility shuffles
  6. Single arm punch towards wall and catch
  7. Rotational throw against wall with eccentric catch and hold
  8. Squat to one hand shoulder press thrust into air
  9. Agility shuffles with ground slams
Detail photo
Detail shot
Detail photo
Detail shot

Board Specifications

  • 36" x 18" x 1/2" (91.4 x 45.7 x 1.27 cm)
  • 9 layer high-grade Baltic Birch plywood
  • Concave ride surface and elliptical shape
  • All boards have a 1/2" continuous rocker
  • 6 solid urethane blocks secure the rail to the board
  • Grip coat on the entire board surface
  • 28" x 14" x 1” (71 x 35.5 x 2.5 cm)
  • Thick one piece steel rail
  • Durable powder coat
  • Sits 2" off the board base
  • 12 lbs (5.45 kg)
  • Weight limit: 400 lbs (181 kg)

Ball Specifications

  • 6.5" (16.51 cm) diameter
  • 20.41" (51.84 cm) circumference
  • 5.5 lbs (2.5 kg)
  • Large hands can easily grip
  • Great ball for two handed throws
  • Solid urethane without air, gel or sand filling to break open
  • Exceptional resistance to friction, oils, solvents, UV, extreme temperatures and is odor free
  • Higher strength and durability compared to rubber, plastic, or vinyl
  • Made as one complete unit and avoids seams
  • Balls are perfectly round
  • Will not break open or wear with repetitive slamming
  • Slight tacky feel with grip bumps for texture
  • Easily grips the board and ground surfaces for safety
  • Will not slip on carpet or tile floors compared to wood or plastic rollers

Keep-It™ Money Back Guarantee
We’re confident you’ll love your Onnit supplements. If the product doesn't perform for you, however, we’re not gonna play games with you. Order any of our entry size supplements, and if you don’t like it, you can keep it! Notify our team, telling us why it wasn't a fit for you, and we’ll get you a refund right there on the spot - no return necessary. We just ask that you try it out for at least two weeks to give it a fair shot.
Our Keep-It™ guarantee is valid for the first-time purchase of a formula, and redeemable up to three months (90 days) after the purchase date. Multiple bottles, foods, apparel and gear do not fall under this guarantee, however, they may be applicable for return. Fitness equipment, personal care products, knowledge purchases, digital products, and DVDs are not eligible for return or refund. For more information and a full list of products that qualify, visit our Keep-It™ page. Further details can be found on our Refund Policy support page.
Military & First Responder Discount
In thanks to military and first responders, we're extending a 15% discount on all products purchased at
To qualify, just verify your status during checkout on the payment step. We verify through, our trusted technology partner for secure digital identity verification. (Learn more)
After verification once, you should have the discount auto-apply on that and all future orders.
Please note that this discount cannot be combined with other coupon codes.
If you have any questions or issues with the verification process, please don't hesitate to reach out to customer service.
* US Military members, please choose United States as your destination country when creating your customer profile, as this will ensure your package ships via USPS and that you are not given international shipping rates.
Subscribe & Save 15% now
With a subscription, you'll get your favorite Onnit products whenever you want, at 15% off. All automatic, worry free, and with our same great money back guarantee.
Cancel, pause, or adjust your order at any time, hassle free. Your credit card will only be charged when your order ships. The discount applied every time is 15% off. Since it would be weird to subscribe to a kettlebell, the subscriptions and subscription discounts are only for things you'll need often, like supplements, foods, and personal care items.

Secure Shopping

We implement a variety of security measures to maintain the safety of your personal information when you place an order or enter, submit, or access any information on our website. We incorporate physical, electronic, and administrative procedures to safeguard the confidentiality of your personal information, including Secure Sockets Layer (SSL) for the encryption of all financial transactions through the website. We use industry-standard, 256bit SSL encryption to protect your personal information online, and we also take several steps to protect your personal information in our facilities. For example, when you visit the website, you access servers that are kept in a secure physical environment, behind a locked cage and a hardware firewall. After a transaction, your credit card information is not stored on our servers.