one of the best and most painful...i didn't try the link but it's best to do it with your hands down your waist so you can use more wt as your shoulders will give out with the should flexion style...like calves, forearms are pretty much totally genetic so if they're s,mall now, it will be hard to make them bigger...i would start on increasing grip strength 1st which will allow more wt to be used on not just forearm but all exercises thus bigger muscles