Effect · Fun & Viral
The Bicep Flex — one arm, huge muscle.
The Bicep Flex turns an everyday photo into a strongman pose. The person raises one arm and it swells into a thick, veined bicep, and in the sample red or yellow comic burst lines appear behind them. The sample opens on a woman with long dark hair and hoop earrings in a loose white t-shirt, standing in a dim green room.
The sample
What happens in the The Bicep Flex sample.
The sample is a reel of four runs. In the first, a woman with long dark hair stands in a loose white t-shirt, then turns her back to the camera and curls a thick, muscled arm. Next, a young man with curly hair in a red tank top looks down, then flexes a bulging bicep against red burst lines. A woman in a red-and-white striped top and jeans turns from a red wall to flex. Last, a woman in a white headband on stone steps flexes as a yellow comic burst fills the frame.
Across the runs, each person keeps the hair, face and clothes from the opening frame. What changes is the flexing arm, which grows far past normal size, and the backdrop, which gains comic burst lines. Several runs turn the body to a back or side view to show off the arm and shoulder. Since the sample starts from waist-up or half-body shots with an arm free, a photo framed that way gives the pose room.
The recipe
The Bicep Flex, on paper.
Read from the effect catalog the app itself ships, so these are the settings your run will use.
| Spec | This effect |
|---|---|
| Engine | PixVerse |
| Resolution | 720p or 1080p |
| Clip length | 5s or 8s |
| Cost | 2 credits at 5s 720p · 4 credits at 8s 720p · 4 credits at 5s 1080p · 8 credits at 8s 1080p |
| Source images | One photo |
| Aspect ratio | Follows your photo |
| Category | Fun & Viral |
| Text prompt | None — the engine's own template |
Your photo
Photos that suit it.
One-tap effects have one input. The photo you pick is your creative control.
One person, upper body
Every run in the sample starts from a single person shown from the waist or chest up, so a similar solo framing is a good place to begin.
Leave space around the arm
The flexed arm grows well past the body in each run. A photo with some room at the sides gives it space to fill.
Sleeveless tops show the arm
Tank tops and a loose t-shirt in the sample leave the arm bare, so the new muscle reads clearly. Short sleeves or no sleeves match that.
How it works
Running The Bicep Flex in four steps.
Pick your photo
The tips above come from what the sample shows. A clear, well-lit subject is the safe start.
Open Fun & Viral and tap The Bicep Flex
In the King AI app on iPhone, iPad or Mac, or in the web studio. Opening the effect does not spend credits.
Choose the length and resolution
5s or 8s, 720p or 1080p. Cost: 2 credits at 5s 720p · 4 credits at 8s 720p · 4 credits at 5s 1080p · 8 credits at 8s 1080p.
Generate, then try another photo
The photo changes the result more than a second run of the same photo does.
Keep exploring
More Fun & Viral effects.
Squish
Squash the subject with a playful squeeze
ExploreExpansion
Your subject swells into a glossy balloon and floats off.
ExploreFuzzy Fuzzy
An everyday object becomes a smiling plush toy that hops.
ExploreEvery effect, by category
All the effect pages on one list, grouped the way the app groups them.
ExploreFAQ
The Bicep Flex, answered.
What does the The Bicep Flex effect do?
A reel of four short clips: three women and a man in tank tops and t-shirts each turn and flex one giant bicep while red or yellow comic burst lines fill the background.
Does the bicep flex effect change my clothes or background?
In the sample, clothes, hair and faces stay as they were in the opening frame. The background changes more: a dim room, a white wall, a red wall and stone steps all gain red or yellow comic burst lines once the arm flexes. The effect takes a single photo, and each run shows one person.
How much does The Bicep Flex cost?
2–8 credits per run: 2 credits (~$0.80) at the default length and resolution, more for a longer or sharper clip (2 credits at 5s 720p · 4 credits at 8s 720p · 4 credits at 5s 1080p · 8 credits at 8s 1080p). New verified accounts receive 3 welcome credits once. The welcome bonus covers one supported first run costing 2 credits.
How long is a The Bicep Flex video?
5s or 8s at 720p or 1080p. It follows the shape of your photo. Nothing you export is watermarked, on any plan.
Do I need to write a prompt?
No. The Bicep Flex is a template on the PixVerse engine. King AI sends the effect's name and your photo; there is no text prompt to write.
Get started
Try The Bicep Flex.
New verified accounts receive 3 welcome credits once. The welcome bonus covers one supported first run costing 2 credits. Nothing you export is watermarked.