User manual

Ultimateinstability™ products are diverse and simple to use. To ensure you get the best, most durable and safe use out of our products please follow the instructions below.

How to fill your UI product.

Watch the quick how-to video above and then follow the detailed steps below.

  • Step 1

    Locate the valve and unscrew the cap by turning it counter-clockwise, then place the product in a large sink, bathtub or on the ground near a water source.

  • Step 2

    Check if the valve is pressed down to its lowest position before trying to fill the product with water to ensure the flow of water is able to enter the product.

  • Step 3

    Steady the product and direct the flow of water into the valve. Once the bag is filled with your desired level of water, pop the valve back up by pressing it to its highest locked position.

    More about the styles of training – InBalance / InSync / InPact – please click here .

  • Step 4

    Place the adapter attachement onto the valve and turn to lock. Using the provided handpump, fill the product until it feels firm. Before closing the valve with the cap, ensure no air escapes.

  • Step 5

    Place the cap on the valve and twist it clockwise to close. Do not attempt to exercise with the product until the valve is safely closed!

How to install the tube in your Hydrovest.

Watch the instructional video below and follow the steps below.

  • Step 1

    Place the Hydrovest with its back on the ground so that the chest closures are pointing upward. Loosen the upper straps so the tube fits easily between them.

  • Step 2

    Only if the tube does not have Velcro strips but handles instead, place the included add-on patch with the Velcro over the Velcro in the vest. This add-on patch keeps the Aquabag from sliding into the Hydrovest.

  • Step 3

    Fill the tube with the desired weight of water. More information about the recommended amount of water can be found under

  • Step 4

    Pull the tube, with water but without air, under the upper straps so that the tube is in the middle and there is an equal amount of tube on both sides of the vest.

  • Step 5

    Once the tube is in the center of the vest, the tube can be inflated with air. The upper straps are divided into two parts. Part 1 is mounted to the vest and to the buckle. Part 2 goes from the buckle to the shoulder strap. At the moment that the tube is inflated you can pull part 1 to fix the tube in the vest. Part 2 of the upper straps you use to adjust to the desired wearing comfort.

How to adjust the Hydrovest to your body size.

Follow the steps in the video to adapt the Hydrovest to your body size.

How to empty your UI product.

Please follow the steps below to empty your UI product.

  • Step 1

    Place the product in a large sink, bathtub or area that allows for proper drainage. Locate the valve and unscrew the cap by turning it counter-clockwise.

  • Step 2

    Ensure the valve is pressed down to its lowest position which opens the entry way. Now turn the bag upside down and drain the water. Gently press the air out of the product, this will help with draining the water.

  • Step 3

    To fully deflate the product completely fold it in and lightly press down on the product until all air has been release.

    More about the styles of training – InBalance / InSync / InPact – please click here .

Training styles.

“Be water” by Bruce Lee; he was the first to direct us to the importance of being like water in our movements. incorporates the power of water as a driving force to move better.


Balanced – stay in full control, avoid movement of water and make as little noise possible.


Explosive – get hit by the water, create impact and loud noise caused by the sloshing water.


Synchronise – be like water, follow the flow and move along with it in a rhythmical way.

Maintenance tips.

  • If you plan on keeping the bag/ball filled for a prolonged period (several months). The water inside may become cloudy. To prevent this, add ¼ cup of plain white vinegar per every gallon of water you use in the bag. The natural acidity of the vinegar will help neutralise the alkalinity in the water, assisting in the prevention of water discolouration.
  • When not in use, store the bag/ball in a cool, dry place, out of direct sunlight. Store it away from extreme heat or cold to avoid melting the plastic or frozen water.
  • Although our products are tough to handle we do not recommend that they are used for slamming or throwing exercises. Unleash your frustration on other products.
  • Before using your bag in an unfamiliar area or outdoors, inspect your surroundings for nails, broken glass, or other sharp object that may tear or puncture the bag/ball. Failure to follow these directions may result in damage to the bag/ball and leakage.

Product warranty

  • Purchases by consumers on our website are automatically covered by our warranty policy.
  • Ultimateinstability products are covered by a twelvemonth warranty for manufacturers’ defects and faults.
  • We will exchange/replace/refund to the customer’s satisfaction all products affected by manufacturers defects. Contact your local dealer initially.
  • This warranty does not include normal wear and tear, aesthetic appearance or bags/balls that have been used for ‘slamming’ exercises.


  • Always consult your doctor/physician before starting with any exercise regime. Ultimateinstability will not be held responsible for any injury or death that occurs while using this product.
  • Check your product for any manufacturing defects before usage. If defects are evident, do not use the product and contact Ultimateinstability immediately.
  • Ultimateinstability recommends seeking assistance from a certified personal trainer before commencing training.
  • Follow product instructions to make products ready for training.