Approach flexing as another part of your balanced training program. Always find room for it at least once per exercise cycle. You can do it on your day off from the gym, or, if you find that you're overtraining to the point where you're still sore and feeling a bit depleted on the day you're supposed to go back to work out, try taking the day off from progressive-resistance training and instead do some flex training. You'll find that your muscles will respond to the attention. Flexing also helps muscular definition and brings out your veins—provided that you've eaten just the right amount of glycogen-sustaining carbohydrates.
I've has USN muscle fuel anabolic a couple of times now after switching from the hyperbolic mass. I much prefer this shake because it makes me less bloated and gives me the same amount of protein as opposed to hyperbolic. I find that it's much easier to have a 2/3 of these without feeling too bloated or sick, whereas with hyperbolic mass I found myself not wanting to eat food . I use it mid-morning between breakfast and lunch as a snack, and then lost workout or as a mid afternoon snack if I can't get to the gym, I find that it digests really easily and I can eat all my other meals throughout the day as well so overall it's a fantastic shake and it puts size on well.
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 .