Capturing Fitness Movements with Motion Capture
Why This Movement Matters to Me
Recently, I’ve been really focused on fitness and physical well-being. As I got into gym workouts, I realized how tricky it is to maintain proper posture. I’ve even heard stories of people injuring their backs because of incorrect form, which made me cautious about my own training. That’s why I’m motivated to explore posture in detail. With motion capture, I can actually see movements in 3D and better understand what “correct form” looks like.
Personal Context
For me, the motivation behind this project doesn’t come from the historical or cultural background of movements, but from my own personal experience. I’ve recently been more committed to fitness, especially gym workouts, and I’ve struggled with maintaining proper posture. Seeing how easy it is for people—including myself—to move incorrectly, and hearing stories of injuries from bad form, pushed me to take posture seriously.
That’s how I got the idea to use OptiTrack to explore fundamental exercises of gym workouts to figure out the correct posture. Ideally, it would have been best if we could capture the motion of professionals actually using gym equipment like the weight bench, lat pulldown machine, or chest press machine. But since we have space constraints and can’t load in large machines, we’ll likely focus on workouts that don’t require them—like dumbbell exercises and mat-based movements.
Ethnographic Considerations
To engage thoughtfully, I would:
- Interview trainers to learn what cues they give when correcting a student’s form. These verbal and visual corrections are as important as the movement itself.
- Capture professional trainers’ movements directly with OptiTrack, since they already demonstrate the correct posture. This way, the dataset reflects expert performance rather than just student attempts.
- Observe or ask practitioners about where posture most often breaks down.
- Focus on practical application rather than cultural depth, since my main context is personal and fitness-related.
Concept: Capturing Posture in the Studio
Given the OptiTrack setup, the focus will be on movements that fit the studio space. This includes:
- Bodyweight fundamentals (squats, lunges, planks, push-ups).
- Light dumbbell exercises like curls or shoulder presses that can be done without large equipments.
- Running machine (treadmill) movements — capturing walking or running gait.
- Use photogrammetry to scan our own face and body and apply it to the avatar, so we can see the “perfect workout movement” represented on our own bodies.
Feasibility for the Class
- Resources: OptiTrack studio, possibly dumbbells, and access to trainers both for interviews and for recording their professional movement data.
- Constraints: No gym machines due to space, but fundamentals and weighted basics are enough.
Why I’m Excited
This project connects directly to my personal experience. I’ve been working to improve my posture at the gym, and I know how easy it is to do things wrong without realizing it. Motion capture feels like a perfect tool to visualize these movements in a way I could never see in a mirror. By capturing and analyzing posture in 3D, I can deepen my own understanding of correct form—and maybe create something useful for others learning these same exercises.
Possible Outputs
By the end of the semester, my project could take several forms:
- Skeleton Animations: clean skeletal recordings of different exercises (squats, lunges, push-ups, dumbbell curls) that demonstrate “correct form.”
- Comparative Overlays: side-by-side or layered skeletons showing two different takes (e.g., correct vs. slightly incorrect posture) to highlight where form breaks down.
- Cue Annotations: integrating notes or visual markers (inspired by trainer interviews) that indicate what to adjust—like “keep your back straight” or “knees aligned.”
- Photogrammetry Enhancement (optional): scanned visuals of a performer or environment layered over the skeleton, adding more context for how the body looks in 3D space.