@3aa33ca7 All kettlebell exercises, when done properly, target the core. Form is the most important part. The key to avoiding injury is to keep your abdominals and glutes tight. It is physically impossible to hurt your lower back while those two muscle groups are engaged.

I would also work on making sure you've got the mechanics down for cleans and snatches without flopping the kettlebell onto the back of your wrist. The proper motion will have near zero force of impact. 

 @3aa33ca7 Also, if you're having trouble with the kettlebell smacking the backs of your forearms, you may be using too light a weight. I too, recommend Turkish get-ups, usually near the end of the workout to close on tough ab work.

Toe touches with the kettlebell on your back is good sub for crunches. Follow with Russian twists and end on planks.

Boom! You got ab ripples! 

 @26769ed7
Sounds good I will keep this in mind!