Training split structure doesn't affect muscle growth when volume is matched; protein's metabolic advantage is short-lived and not meaningful for fat loss.
Original: 3 Sweet new studies to maximize your gains
Evidence shows training splits are irrelevant if volume is equal, and protein's thermic effect doesn't meaningfully aid fat loss long-term.
Quick Answer
The first study found that push/pull and upper/upper training splits are equally effective for muscle growth and strength when total training volume is matched, debunking the myth that split structure matters more than volume. The second study showed that squats and leg extensions complement each other: squats better develop the vastus lateralis (outer quad sweep), while leg extensions better target the rectus femoris (middle quad), making both essential for balanced thigh development. The third study revealed that increasing protein intake beyond the optimal level for muscle growth provides negligible thermic advantage for fat loss, as any metabolic benefit is minimal and mostly tied to muscle mass increases, not protein digestion alone.
Claims (20)
1. New lifters get stronger at leg extensions by doing squats, but experienced lifters need to do leg extensions to get better at them.
2. Your body burns more calories digesting protein than carbs or fat.
3. Your body burns more calories digesting protein than carbs or fat.
4. Squats make the outer thigh muscle grow more near the knee because the muscle is stretched more during the movement.
5. Eating extra protein doesn’t burn more calories over time if you’re already eating enough for muscle growth.
6. Eating extra protein doesn’t burn more calories over time—even though it does right after eating.
7. Muscles grow when they're pulled hard enough, no matter when or how often you pull them.
8. Muscles grow when they're pulled hard enough, no matter when or how often you pull them.
9. Leg extensions make the front thigh muscle grow more than squats because squats don’t let that muscle work as hard.
10. Squats make the outer part of your thigh near the knee grow more than leg extensions do.
11. The more you practice a specific move, the better you get at it—but beginners get stronger faster by doing big compound lifts.
12. The more you practice a specific move, the better you get at it—but beginners improve faster by doing big, complex lifts.
13. Leg extensions make the front part of your thigh grow more than squats do.
14. Resting longer between sets lets you lift more total weight, which makes muscles grow bigger.
15. Resting longer between sets lets you lift more total weight, which makes muscles grow bigger.
16. Even if your body burns 25% of protein calories digesting it, you still store or use 75% of them as energy.
17. New lifters get stronger at a movement by doing similar big exercises, even if they don’t do the exact movement, because their brain learns to move better.
18. Eating more protein makes you bigger muscles, and bigger muscles burn more calories all day—even if digesting protein doesn’t.
19. Eating more protein makes your muscles bigger, and bigger muscles burn more calories all day—even if digestion doesn’t.
20. When you squat, your front thigh muscle can't work as hard because it's stretched across two joints at once.
Key Takeaways
- •Problem: People think fancy training splits or eating tons of protein will help them grow muscle and lose fat faster, but many of these ideas aren’t backed by science.
- •Core methods: Push/pull vs upper/upper training splits, squats, leg extensions, high protein diets.
- •How methods work: Push/pull and upper/upper splits work the same if you do the same total amount of work; squats build the outer part of your thighs (vastus lateralis) because they involve deep knee bending, while leg extensions build the middle part (rectus femoris) because they isolate it; eating more protein than your muscles need doesn’t burn extra calories significantly—any small boost comes from having more muscle, not from digesting protein.
- •Expected outcomes: You’ll build equal muscle with either split, get fuller, more balanced thighs by doing both squats and leg extensions, and avoid wasting calories on extra chicken breast that won’t help you lose fat.
- •Implementation timeframe: Results were seen after eight weeks of consistent training and diet adherence in the studies.
Overview
The problem is determining which training and nutritional strategies provide the greatest gains in muscle growth and strength without falling for ineffective myths. The solution involves three evidence-based methods: (1) prioritizing total training volume over split structure, (2) combining squats and leg extensions to target all quadriceps heads, and (3) avoiding excessive protein intake beyond the optimal level for muscle synthesis, as its thermic advantage is negligible for fat loss.
Key Terms
How to Apply
- 1.Use either a push/pull or upper/upper training split for upper body, ensuring total weekly volume (sets × reps × weight) for biceps, triceps, and chest is matched between sessions.
- 2.Include both squats and leg extensions in your leg workout routine: perform 3–4 sets of 8–12 reps of squats to target the vastus lateralis, and 3–4 sets of 10–15 reps of leg extensions to target the rectus femoris, 2–3 times per week.
- 3.Consume protein at 1.6–2.2 grams per kilogram of body weight daily for muscle growth, and do not increase intake beyond this range solely for fat loss, as the thermic effect is negligible and excess protein adds unnecessary calories.
You will achieve equal muscle growth regardless of split structure, develop balanced and full quadriceps by targeting both the outer and middle heads, and avoid overconsuming protein for fat loss—saving calories and improving dietary sustainability without sacrificing results.
Additional Links
Claims (20)
1. New lifters get stronger at leg extensions by doing squats, but experienced lifters need to do leg extensions to get better at them.
2. Your body burns more calories digesting protein than carbs or fat.
3. Your body burns more calories digesting protein than carbs or fat.
4. Squats make the outer thigh muscle grow more near the knee because the muscle is stretched more during the movement.
5. Eating extra protein doesn’t burn more calories over time if you’re already eating enough for muscle growth.
6. Eating extra protein doesn’t burn more calories over time—even though it does right after eating.
7. Muscles grow when they're pulled hard enough, no matter when or how often you pull them.
8. Muscles grow when they're pulled hard enough, no matter when or how often you pull them.
9. Leg extensions make the front thigh muscle grow more than squats because squats don’t let that muscle work as hard.
10. Squats make the outer part of your thigh near the knee grow more than leg extensions do.
11. The more you practice a specific move, the better you get at it—but beginners get stronger faster by doing big compound lifts.
12. The more you practice a specific move, the better you get at it—but beginners improve faster by doing big, complex lifts.
13. Leg extensions make the front part of your thigh grow more than squats do.
14. Resting longer between sets lets you lift more total weight, which makes muscles grow bigger.
15. Resting longer between sets lets you lift more total weight, which makes muscles grow bigger.
16. Even if your body burns 25% of protein calories digesting it, you still store or use 75% of them as energy.
17. New lifters get stronger at a movement by doing similar big exercises, even if they don’t do the exact movement, because their brain learns to move better.
18. Eating more protein makes you bigger muscles, and bigger muscles burn more calories all day—even if digesting protein doesn’t.
19. Eating more protein makes your muscles bigger, and bigger muscles burn more calories all day—even if digestion doesn’t.
20. When you squat, your front thigh muscle can't work as hard because it's stretched across two joints at once.
Related Content
Claims (10)
The total mechanical tension accumulated over time is the primary stimulus for skeletal muscle hypertrophy, regardless of the temporal distribution of training sessions.
Total mechanical tension accumulated over time is the primary stimulus for skeletal muscle hypertrophy, regardless of the temporal distribution of training sessions.
Increasing rest intervals between sets enhances total training tonnage, which amplifies mechanical tension accumulation and thereby increases the hypertrophic stimulus.
Increasing rest intervals between sets enhances total training tonnage, which amplifies mechanical tension and thereby increases skeletal muscle hypertrophy.
Increased total daily energy expenditure from high-protein diets is mediated by elevated fat-free mass resulting from enhanced muscle protein synthesis, not by sustained diet-induced thermogenesis.