The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
Tired of waiting around in the gym for the right weights to be free? New research form the US means you can make gym queues like this a thing of the past, as it proves that you can build muscle just as fast using lighter weights. Traditional exercise wisdom says that the quickest way to build big muscles is to lift as heavy as possible. However, the new study shows you can get equally impressive results from going lighter but performing more repetitions. The only condition is that you must do all your sets to failure. So, next time your preferred dumbbells are taken, just switch down and up your reps. You'll be out of the gym that much quicker and still see the growth you're looking for.