This is a variation for your biceps. Usually, the little rope extension is used to do triceps on the cable rack. Put the part of the machine where you attach weights at one of the lowest holes. Attach the little rope attachment. Stand with legs shoulder width apart. Use a weight that gives you a workout and is doable. Grab the end and perform a biceps curl. Exhale when you lift and inhale when you return to the starting position. Do not extend your elbow fully and lock it. Keep your elbows to your sides, under your ribs, for steadiness. Do four or five sets of ten repetitions, depending on the weight and your fitness level. Do not bop forward and backward. Keep your body steady, especially your back.
Disclaimer: None of the above information can be taken as a substitute for advice from a medical professional such as a physician.
My third book, Pocket Guide to Fitness, is available on www.louizapatsis.com, http://www.authorhouse.com, www.bn.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.