Static stretching before weight training can be beneficial if it improves form by overcoming tightness or limitations, even if it reduces the maximum weight lifted.

“There are instances, for example, where an individual might want to do some static stretching to increase limb range of motion prior to doing weight training even if it's going to inhibit that person's ability to lift as much weight. Why would you want to do that? Well, for instance, if somebody has a tightness or a limitation in their neuromuscular connective tissue system someplace in their body and system that prevents them from using proper form, that they can overcome by doing some static stretching. Well, that would be a great idea as Dr. Galpin points out.”