Although I have never played Pétanque, one can learn much by watching. 
The guys playing in Le Luco* on a Sunday afternoon were experts in form and accuracy. 

A few fine points:

All of the balls are a dull silver color without any special markings,
but everybody seems to know which ones are theirs.  Actually, they come in different sizes, weights, groove patterns, and hardness.

Do you see the pendant around his neck? 
It is a cord with a boule lifter magnet, perfect for picking up his boules
without stooping over.

Don't forget about the soft cloth to wipe off grit from the boules

(*Le Luco - the nickname for Luxembourg Gardens)

Jardin du Luxembourg
75006, Paris