MotionAISkip the gym, flex anyway
Muscle Flex gives the person in your photo a very athletic build: their arms and shoulders grow, their clothes stretch over them, and they flex their biceps at the camera with a confident grin. Dramatic gym lighting sets the mood, and the face stays the same. It's a reliable laugh in group chats, especially with friends who never lift.
- 150 credits
Effect
How it works
- 1
Upload a photo
Pick a clear photo. The tips below help you get the best result.
- 2
Add details if you like
The effect works on its own; a few words in the prompt box add your own touch.
- 3
Get your video
Your 5-second video is ready in a few minutes. Play it here or download it.
Photos that work best
- A waist-up or full-body photo of one person
- Arms visible, not crossed or hidden behind something
- A front-facing shot with the face clear
Ideas for the prompt box
- Put a busy gym with heavy weights in the background
- Make them flex on a beach at sunset
- Finish with a proud nod to the camera
Questions about this effect
Will the face change?
No, the face is kept identical. Only the body gets bigger, with the clothes stretching to fit.
Who gets the muscles in a group photo?
It's designed for one person, and with several people you can't control who changes. Crop to one person if you can.
Does it take clothes off?
No, the clothes stay on and stretch over the bigger arms and shoulders. MotionAI doesn't make sexual or intimate content.
How long does it take?
Most videos are ready in a few minutes. You can leave the page; your video waits for you under Your videos.
What if a video fails?
If a video can't be made, its credits go back to your balance automatically.