Add Barbell Squat runner

[qyuja]

Pull Request

Type of Change

• Add a new runner
• Fix or improve an existing runner
• Other (site, docs, tooling)

Summary

Adds barbell-squat, an original monochrome rear-view barbell squat animation. The eight-frame loop moves from standing through a deep squat and mirrors the descent frames for a stable return to lockout.

Checklist for Adding a Runner

• I have read CONTRIBUTING.md and followed the steps described there.
• The runner is my original work, or I hold the rights to it, and I consent to its distribution under this repository's license (Apache-2.0).
• The runner does NOT contain third-party intellectual property (e.g., Pokémon, Mario, or other copyrighted/trademarked characters).
• Files are placed at runners/<runner-name>/ as <runner-name>-frames.zip, metadata.json, and preview.png.
• All frames are PNG files named <runner-name>-frame-<N>.png (numbered from 0), with a height of exactly 36px, a width between 10px and 100px, and all frames share the same size.
• The zip contains only the frames — no .DS_Store, __MACOSX/, or ._* entries.
• metadata.json contains the correct author, displayName, type (monochrome or color), and tags.
• preview.png is an animated PNG (APNG), 36px tall, at most 100px wide, and animates correctly.
• runners/manifest.json includes the new runner name and stays sorted alphabetically.

Validation

python3 .github/scripts/validate_runners.py --all

All 43 runners pass validation.

[Kyome22]

A similar runner, "Lift Bro," has already been accepted. It gives the impression of lacking uniqueness.

[qyuja]

@Kyome22 Thanks for the feedback. Yes, Lift Bro was one of the inspirations for this runner, since both naturally fit the fitness tag. Although they may look somewhat similar at first glance, they depict different movements: Lift Bro focuses on lifting, while this runner shows a rear-view barbell squat with a full descent and ascent. I hope the distinction is clear.

[Kyome22]

I didn't realize I was facing the back of the person lifting the barbell.

[Kyome22]

Could you reduce the left and right margins of the frame as much as possible? Space on the menu bar is extremely prime real estate, so I'd like to eliminate any wasted width wherever possible.

[qyuja]

Thanks for the feedback. I’ve updated the runner to make the rear-view back details clearer, reduced the left and right margins, and refined the barbell so the supported center is slightly higher than the weighted ends.