One of the most versatile and, best value training tools available to the BJJ athlete is the kettlebell. The dynamic and ballistic nature of kettlebell training, using pushing, pulling and rotational whole body movements make them an ideal training aid for BJJ.
One of the main benefits is that of explosive hip flexion/extension, this can also be trained using Olympic lifts, but for those who don’t have access to an Olympic Barbell, bumper plates and lifting platforms, there are kettlebells at a fraction of the price.
A brief intro to the sport-specific applicability of Kettlebells for Jiu Jitsu, Judo and MMA:
Josh Vogel shows a simple comparison between the first part of a turkish get up and completing the armbar from the guard when someone stacks you:
The first part of the turkish get up and how it relates to a simple side mount reversal: