The concept of accommodating resistance using chains has become popular over the past two decades and for good reason. Since an ascending strength curve exists on an exercise like the front squat, chains can “accommodate” strength by offering more resistance at the top of the movement where you’re stronger than at the bottom where you’re weaker.
All you need to do is attach chains to each side of a barbell as a form of resistance. Then, as you lower the bar, the chain links collect on the ground and the resistance decreases. When you go to raise the bar, each chain link gets lifted from the ground one-by-one and the resistance increases. Voilà, more resistance at the top where you’re stronger and less at the bottom where you’re weaker!
Try using chains next time you do front squats. For more information, check out Full Squats with Chains.