Both exercises target all three heads of your tricep, resulting in better overall tricep development to give you healthy progress. Additionally, the way you grip the tricep bar during these exercises gives you a better range of motion, lessening the burden placed on your elbows, forearms and wrists as opposed to a traditional straight bar.
To successfully complete a French press, simply hold the bar over your head and slowly lower behind the head by bending your forearms at the elbow. We recommend that you perform three or four sets of 6-12 reps. As for the skull crusher; lay flat on a bench and lift the bar over the chest area in a similar fashion to a flat barbell press. Then, lower the bar to the forehead, bending your arms at the elbows and keeping the upper arm straight. The bar is then raised back to the starting position, above the chest. Again, like the French press, we recommend the same amount of sets and reps to gain maximum efficiency for optimum results.