How to Check Your Exercise Form With AI Quiz

Answers and explanations appear as you take the quiz.

1. What does a pose estimation model output for each video frame?
   • A 3D scan of the whole body surface
   • Coordinates for body landmarks called keypoints
   • A heart-rate reading
   • The weight on the bar
2. How many landmarks does Google's MediaPipe Pose track, according to the guide?
   • 33
   • 17
   • 12
   • 68
3. Why might an app filming from the side miss knees caving inward?
   • Knee caving only shows up in slow motion
   • Side views hide the hips
   • Inward knee movement runs toward or away from a side camera, which a flat image shows poorly
   • Apps do not track knees
4. Which problem does the guide say is mostly invisible to a single-camera app?
   • Whether you did 8 or 10 reps
   • Whether your hips went below your knees from the side
   • Your tempo
   • Bracing, breathing and pressure through the feet
5. Why does the guide say 'good form' from an app does not guarantee safety?
   • The thresholds are generic and ignore differences like thigh length, ankle mobility and injury history
   • Apps always score everyone as good
   • Form does not matter for safety
   • Apps only work for push-ups
6. How is a knee angle calculated from keypoints?
   • By measuring the length of the shin only
   • From the hip, knee and ankle keypoints, using the angle between the vectors from the knee
   • By counting the frames in one rep
   • From the heatmap's brightest color
7. Why do rep counters typically use two different angle thresholds?
   • To measure the weight lifted
   • To tell squats from lunges
   • To stop small wobbles from counting as extra reps
   • To save battery
8. Which situation does the guide say calls for a coach rather than relying on the app?
   • Counting push-ups at home
   • Checking tempo on bodyweight squats
   • Filming from a second angle
   • Feeling pain, learning heavy barbell lifts, rehab, or stalled progress