Do the incline chest machine where the bars can squeeze together. Most gyms should have this modern equipment. Do five sets of ten repetitions.
Do the bench press machine with weights that give you a workout yet not too much pain. See the first bench press blog.
Throw around a medicine all with a friend. Again, the weight of the medicine ball should give you a workout but not hurt you. If you do not have anyone at the moment, push the medicine ball in and out from an inch in front of your chest until your arms are extended but elbows are not locked. Do this with arms at shoulder length.
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.