Ok, I'm getting tons of questions, so I can see I should have better explained what the program is like!
It's an interval training program that cycles in intensity between hard days, easy days and medium days. It uses two movements: Swings and Pushups.
It has three levels of workouts: Beginner, Intermediate and Advanced.
Each day it tells you exactly what to do in the workout, second by second. It's a pretty solid "done for you" program.
The beginner program is be pretty doable for someone brand new to kettlebells. The advanced program is a pretty solid butt kicking for anyone.
Let me know if you have any more questions!
http://www.21daykettlebell.com/
How many kettlebells will someone need for the program and at what weights?