Frequently Asked Questions

How easy are they to fill with water and air?

The valve on your ball has a lock setting where you can press and turn the valve so it is constantly open, allowing a free flow of water in (or out). When filled to your desired weight of water, use the pump to blow air into the ball to fill the space and return the valve to the closed position.

I can lift much more using free weights, will this be too easy for me?

Water Bag training is much more difficult than free-weight training due to shifting loads. Muscles not used in free-weight training will be activated.

What weights are available in the Torpedoes?

  • T1 – 16kg
  • T2 – 20kg

Should they be filled to their limit?

No, even though they’re designed to be filled All the way, you risk the potential of damage if you drop it at max capacity. Generally fill to a max of 95% water so it has some shock absorbency if dropped.

If I drop my Grenade will it break?

All CorMax products including Grenades, are designed to be durable and tough. However it is not advised to drop or throw your bag from big heights (i.e. overhead) as it may compromise the integrity of the bag and reduce its longevity.

Do I need the whole range?

Depending on what you want to achieve. For weight loss, to get lean and strong ladies would probably find the Grenades, T1 and AQA Ball (30cm) sufficient. However guys would probably include a T2, T3 and CorMax AQA Ball of their choice dependent upon the routines required.

Can you wash the CorMax bags?

Yes, this is very easy. Simply hose down or just wipe down with a damp cloth.

Why do I need the Grenades if I have a Torpedo?

Grenades offer a huge range of exercises which cannot be imitated with a Torpedo, similar to small hand free weights or smaller kettle bells.

Who can benefit from CorMax Commander & G&T training?

• Personal Trainers
• Fitness Professionals
• Fitness enthusiasts
• Rugby, AFL, Rugby League
• Tennis
• Martial Arts, MMA, Judo
• Golfers
• Rehabilitation therapists

FAQ’s didn’t answer your question?

Here are several ways to contact us:

Call Us

For questions or enquiries relating to the CorMax range of products, feel free to call us on 0415 965 110.

Email Us

If you prefer, you can email us your questions or enquiries via

Online Enquiry Form

Alternately, if you would rather fill out our Online Enquiry Form.