There were 53 comparisons of lower body strength gains, encompassing 2,287 subjects. In these studies, men got 28.47% stronger, on average, while women got 30.64% stronger. The average difference was 2.17%, with a 95% confidence interval from -0.92-5.26%. This was nearly a significant difference (p=0.087), but probably isn’t practically relevant and would be considered a trivial effect (d=0.08; 95% CI: -0.03-0.19).
Strangely, however, I couldn’t find a meta-analysis comparing strength gains and muscle growth in men and women. I say “strangely” because there are meta-analyses covering damn near every facet of strength training under the sun. Typically, once there are around a dozen studies on a given topic, someone’s going to do a meta-analysis. However, there have been 70+ studies comparing strength gains and muscle growth in men and women over the past 44 years, and no meta-analyses.
Hold two light-to-medium-weight dumbbells with an overhand grip and let them hang at arm’s length in front of your thighs. Lift your left leg a few inches off the floor behind you; this is the starting position. Keeping your lower back naturally arched, hinge at your hips and lower your torso until it's almost parallel to the floor. Let your left leg stretch out behind you with your toes pointed down to the floor the entire time. The dumbbells should travel straight down toward the floor. Return to the starting position without letting the toes of your left foot touch the floor. That’s 1 rep. Do 2 sets per leg.
It’s also one of the very few ways to make bones denser, a perk that is especially important for women. Lifting something heavy, like a dumbbell, makes bones bear more weight, and in exercise, stressing your bones is a good thing (to a point of course). Bones are constantly remodeling, explains Anthony Hackney, an exercise physiologist at the University of North Carolina. “Your body is always adding calcium to your bones and taking calcium away from your bones,” he says.
Keep your body fueled. Proper nutrition is also critical to lean muscle development, and fueling before and after a workout helps maximize the benefits of strength-training exercises, research has found. Before your strength workout, a light snack with carbohydrates and protein in a 4:1 ratio has been shown to be most beneficial. Examples include low-fat yogurt and a banana, or low-fat string cheese with whole-grain crackers. Within 45 minutes after a workout, eat some carbs and protein in a 3:1 ratio – such as stir-fried chicken and vegetables over brown rice.
Complete the exercises in each workout as Straight Sets. For example, you'll do one set of leg presses, rest for 30 seconds, do a second set, rest, do the third set. Then, move on to the next exercise. You'll complete all movements in both workouts this way. Complete 12 reps of all movements for 3 sets each, and rest for 30 seconds in between each set. Choose a weight load where the last two reps of every set are extra hard, where you wouldn't be able to do a 13th rep. You may find that you increase the weight load for each set while keeping the 12 reps for all three sets.