Leg presses make your butt and inner thigh muscles bigger, but leg extensions don’t — if you want to grow those muscles, leg presses are the better choice.

31

Pro

0

Against

Evidence from Studies

Supporting (1)

31

Community contributions welcome

31

Hypertrophic Effects of Single- versus Multi-Joint Exercise: A Direct Comparison Between Knee Extension and Leg Press.

Randomized Controlled Trial

Human

2026 Feb 5

This study found that doing leg presses made the butt and inner thigh muscles grow bigger, but doing knee extensions didn’t — just like the claim said.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Hypertrophic Effects of Single- versus Multi-Joint Exercise: A Direct Comparison Between Knee Extension and Leg Press.

Score: 31

DOI: 10.1249/MSS.0000000000003957

Similar Assertions

Leg presses make your butt and inner thigh muscles bigger, but leg extensions don’t affect those muscles at all.

31

0

88%

Leg presses make your butt and inner thigh muscles bigger, but leg extensions don’t affect those muscles at all.

31

0

88%

Leg presses make your butt and inner thigh muscles bigger, but leg extensions don’t affect those muscles at all.

31

0

88%

Doing leg presses and leg extensions for 12 weeks both make your main thigh muscles bigger about the same amount, but leg presses also make your butt and inner thigh muscles grow more, while leg extensions make the front part of your thigh (rectus femoris) grow much more.

31

0

86%

If you want to make the front part of your thigh (rectus femoris) bigger, leg extensions work better than leg presses — after 12 weeks, leg extensions made it grow 12% more than leg presses did.

31

0

78%