To quote James, “Variations in your blood levels of testosterone impact your ‘base’ level of muscle, but have minimal impact on your relative (%) gains.  Thus, having higher testosterone levels means having a higher base level of muscle.  While the relative gains will be mostly similar, the absolute gains will be higher due to the higher baseline.”  
Just as protein forms the building block of muscle, branched chain amino acids (BCAAs, for short) are essential building blocks of protein. The three BCAAs are leucine, isoleucine, and valine. These three amino acids help provide the basis for protein synthesis, and research shows that consuming BCAAs before a workout can increase protein uptake into muscle tissue and improve post-workout recovery.

Some of my acquaintances at the gym were actually startled when I abandoned the cardio equipment in favor of the ugly dumbbells and weight plates. I have been asked the “aren’t you afraid of bulk” question more times than I care to think about. When I am standing right there, clearly not bulky, this question seems a bit disingenuous. I haven’t really figured out why people keep asking. Having to explain how it is physically impossible for me to ever build enough muscle to be bulky has gotten a bit old. I think from now on I will simply refer them to your article.
Sit on the ground, with your right leg directly in front of you, bent 90 degrees at the knee, knee flat on the ground. Your left leg should be behind you, also bent 90 degrees at the knee, knee flat on the ground Your thighs should also form a 90-degree angle with each other. Now place your hands on the floor on each side of your right leg; slowly lower your chest toward your knee. Go only as low as you can while keeping your shoulders square. Pause and feel the stretch. Return to the start position, then swivel your hips so your left leg is now directly in front of you and repeat the process.
I appreciate such a thorough synthesis on this topic. As a systematic reviewer, my main concern would be a lack of systematic assessment of risk of bias in the individual studies. I see you did a funnel plot to see any bias by study size, but there are so many other things involved in study quality (study design, selection of participants, statistical adjustment for potential con founders, etc). I would be interested to see how many of these studies were fair or better quality (there are several well accepted quality rating tools available for various study designs). I would also be interested to see a sensitivity analysis to see if the pooled results differ when high risk of bias studies are eliminated, for example. Thanks for an interesting read.
There were 63 comparisons of strength gains, encompassing 3,332 subjects.  In these studies, men got 29.41% stronger, on average, while women got 37.42% stronger.  The average difference was 8.01%, with a 95% confidence interval from 4.59-11.43%. This was a significant difference (p<0.0001) and would be considered a small effect (d=0.34; 95% CI: 0.19-0.48).  On average, strength increased about 27% faster in women.
The bodybuilder standby for sets and reps is usually 3-4 sets of 8-12 reps. That's usually the right rep range for muscle growth (hypertrophy). If you're a beginner, make sure your first rep looks just like your last rep. If you fail on the 8th rep, use lighter weight. If you're unfamiliar with many of the movements, stick with lighter weight until you have a great foundation and feel comfortable challenging yourself; this will help you avoid injury.

So what is the best form of strength training? Realistically, it’s the one that you will actually do. Barbell training may be optimal in terms of strength, but if you don’t see yourself actually driving to the gym three days a week, choose a different plan. Likewise, bodyweight training might seem convenient, but if you don’t actually motivate yourself to workout at home, you might have been better off with a different option.
Element 5 Day Yoga offers five 15-minute sequences to pick and choose from based on your mood and motivation. "It's an easy way to get to the mat every day," one tester said, whether your body needs a Stretch & Restore session or more of an invigorating Energy & Flexibility set. Plus "the instructor provided just enough guidance, no unnecessary chatter." Namaste to that.
Each of your workouts should include a warm-up that will activate your muscles, prepare your central nervous system for the workout, and increase your blood flow to your muscles. It's also a great idea to do foam rolling before each workout. For leg workouts, roll the quads, hamstrings, IT band, piriformis, and calves. For upper-body workouts, roll the shoulder, chest, triceps, and biceps.
To hammer this point home: Staci wrote the majority of our free guide, Strength Training 101: Everything You Need to Know. The videos we mention and link to within the guide are generally of her demonstrating them. And we know that women often have to face additional challenges when training in the weight section of a gym (usually it’s idiot dudes who think they need help, ugh).