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The Fine Details

The Ultimate Fitness Board:

Wood Selection:

  • High grade Baltic birch plywood for strength, performance and durability.
  • 45" x 19" x 5/8" 11 ply board top.

Board Shapes:

  • Elliptical (egg) shaped boards allows easy turning on the ends compared to rectangular.
  • Flat surface
  • No rail attached

Surface Treatments:

  • Non-toxic, water based sanding sealers and finish with special grip particles for traction. '
  • Top surface has 2 layers of traction.
  • The bottom has 1 layer of traction.
  • All edges, strap holes and handle are free from grip traction.

Comfort And Ease In Handling:

  • Carry handle is routed into the board for easy carry.
  • All edges, strap holes and handle are routed and sanded for comfort during handling.

Strap Holes:

  • 1" diameter strap hole along the perimeter is placed 1" from the board edge.
  • 7 strap holes and 1 handle create 8 attachment sites.
  • Routed and smooth with wood finish will not damage the strap.

Resistance Band System:


  • 1" ultra smooth polyester webbing that holds up well against abrasion.
  • Strong and durable to resist UV, water shrinkage and mold.


  • Thick 1" diameter ring is welded for added strength.
  • Large enough to clip all 6 resistance bands into the same ring.
  • Ring will continuously rotate and not bind like a d-ring or triangle


  • Smooth grip core: the strap will never bind or drag on the handle.
  • Comfort grip: thick foam ensures cushion on your hands.
  • Strap is built with plenty of hand space to avoid binding.

Long Loop Straps:

  • 15" in length allows you to wrap around large poles and stable objects.
  • 3 welded o-rings creates varied strap lengths to clip in to.

Foot Straps:

  • 10" loop gives you space to wrap around your foot or ankle.
  • Smooth strap allows foot position change with ease.

Resistance Bands:

  • 16" bands with swivel clips at each end will not bind on band rotations.
  • Swivel clips allow you to clip to a fence link, cable or the o-ring.
  • Three resistances: light, medium, heavy.

Carry Bag:

  • Made with a strong nylon mesh to hold all your extra goods including gloves, keys, jump rope and extra bands.
  • Locking drawstring to secure your items.
  • Additional strap and clip allow you to hang the bag on the fence, pole or secure to board rail.

Half Balls:

Si Boards Half Balls create a stable pivot point to balance on. Your half ball will last a lifetime and is ready for you to customize your training.

Urethane Material:

  • Solid urethane with no 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 or piecing together.
  • 3" and 5" half balls are completely flat on the bottom.
  • 6.5" and 8.5" half balls have a recessed are on the flat side.


  • 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 pivot points.


  • Very stiff with slight flexibility.
  • Best described as the hardness of a lacrosse ball.
  • Not as hard or slick as a bowling ball.

3" Half Ball:

  • 1.5" height
  • 0.5 lbs in weight
  • Used on Si-chi board
  • Offers very little tilt for beginners

5" Half Ball:

  • 2.5" height
  • 1.25 lbs in weight
  • Used for beginners on all Starter boards and Ultimate Fitness board

6.5" Half Ball:

  • 3.25" height
  • 2.3 lbs in weight
  • Advanced use on all Starter boards and Ultimate Fitness board
  • Advanced use on Turbo and Powder Original boards

8.5" Half Ball:

  • 4.25" height
  • 4.25 lbs in weight
  • Advanced users on Freestyle and Surf Original boards
  • Very advanced for the Ultimate Fitness board
  • Recommended for the Commando board