Dragon Door Kettlebells's are the best -- and probably the most expensive. That's all I use. After using the best, it was hard for me to settle for less. Serious practitioners should equip themselves with a set of these beautifully crafted weights. The right tools for the job make a difference.
IMPORTANT: They offer a one year guarantee -- no questions asked. Buy one, if later you find you can be happy with something cheaper, send it back. Click here to read more about my recommendations for purchasing a kettlebell.

2. Interval Timer.
If you want to time your intervals, the Gymboss is hands-down the best and least expensive timer on the market. I've got several -- only had a problem once and the company sent a new one immediately no questions asked.
3.
Enter The Kettlebell!Strength Secret of the Soviet Supermen is a must-read. Written by Pavel Tsatsouline, trainer of the Russian Special Forces, who started the kettlebell revolution here in America. The companion DVD is necessary to 'see' the proper movements.
That's all you need -- isn't that great!
But there is always more to learn . . .
What Shoes to Buy -- article at Begin2dig by mc

I haven't met anyone -- especially myself -- who hasn't kicked themselves for not getting some RKC instruction sooner.
Naked Warrior expands upon the Hardstyle principles in Enter the Kettlebell. It is a set of profound strength principles that can be applied to any tool. This is the first book I read, and started me on this path. Highly recommended.
Highly recommended.Everyone ought to master their on bodyweight. The genius of Convict Conditioning is the step-by-step progressions for mastering the big 6 bodyweight exercises. Proven in extreme conditions.
I like Matt Furey. His Combat Conditioning is less detailed, but very inspirational. I'm grateful for the impact he has had on my strength & conditioning.
You'll hear about Viking Warrior Conditioning sooner or later. Written by an Olympic trainer, research-based snatch protocols to increase VO2max.FREE Prep Training, if you sign up for the RKC or HKC through the links below. These workshops include skill and strength tests that demand thorough preparation. I'll make sure you are ready -- 5 hours / sessions of training for RKC or 3 hours / sessions training for HKC. You must contact me --Send Me Email