Steve Cotter World-renowned martial artist and strength & conditioning specialist. Two times US National Full Kontact Kuoshu (Kung Fu) Champion "I play with every type of kettlebell I can get my hands on. I travel around the world teaching kettlebell seminars and also take part in numerous international kettlebell sport competition, so I have seen just about every design of kettlebell in existence. If someone suggests to me that a basic kettlebell could be improved upon, I am be skeptical. However, when I heard that John Brookfield had developed his own kettlebell I was intrigued, because I know that John is one of the pre-eminent authorities in the world when it comes to strength training and he is equally creative as he is a gifted strength athlete. Having trained with the JB Kettlebell for a few weeks now, I can say that it does offer some unique properties and it is a valuable strength training and conditioning tool. For one thing, the thick handle is great for me, because my grip is typically the weak link in my own kettlebell practice. From even just a few weeks with doing long sets with the JB Kettlebell, my grip is becoming much stronger than when I use the standard-sized competition bells. Another unique effect is what John calls CMCT, which is Constant Moving Changing Tension. This has a unique conditioning effect for the tendons and joint, I believe, because of the additional pulling that takes place as the shot (or sand or gravel) moves around inside the bell. The ballistic shock that occurs because of the shifting and counter-action is very practical training for martial artists and all high-impact athletes." View all Steve Cotter Coaching DVDs Sam Dovey Professional Kettlebell & Olympic Weightlifting Coach "Just when I thought kettlebells could not get any harder, I picked up a JB Hollow filled kettlebell. I have been using kettlebells, powerlifting and Olympic lifting for many years and always enjoy a new challenge so wanted to give them a try. Straight away I noticed the Constant Moving Changing Tension in exercises such as Turkish get ups and even catching bells bottoms up from the clean. You have to fight to decelerate the contents of the kettlebell as well as the bell itself. I have owned or used virtually every make of kettlebell and this is the best kettlebell to date. The handles are the thickest I have seen and the finish is great. You obviously have a great cost saving because one JB Kettlebell can do the job of nine, but more importantly from a progress perspective you can bridge the gap by increasing the weight a little at a time, meaning you will always progress and not get stuck between 24-32kg or 40-48kg. I am very impressed by the John Brookfield Kettlebells and now understand the value of hollow fillable kettlebells and realise why the strongmen of old achieved such feats of strength!" For professional kettlebell training courses & Olympic lifting, contact Sam at www.kettlebelltrainer.co.uk