I have a 4 x 100m relay race next four days later.How can I increase my speed fast without any equipments?

It's only 100m so stamina should'nt matter,|||If Anabolic Steroids are not an option, then I would say to workout out moderately, and make sure that you don't overdo it. If you're rested, you'll perform at your best. I will get thumbs down for this, I know it, but Anabolic Steroids would make you faster than a racehorse. Just go to your doctor, pretend like you're sick, and maybe he'll prescrible prednisone, or something like that.......