Abstract
We present GymSkill, a personal trainer for ubiquitous
monitoring and assessment of physical activity using standard fitness
equipment. The system records and analyzes exercises using the sensors of
a personal smartphone attached to the gym equipment. Novel fine-grained
activity recognition techniques based on pyramidal Principal Component
Breakdown Analysis (PCBA) provide a quantitative analysis of the quality
of human movements. In addition to overall quality judgments, GymSkill
identifies interesting portions of the recorded sensor data and provides
suggestions for improving the individual performance, thereby extending
existing work. The system was evaluated in a case study where 6
participants performed a variety of exercises on balance boards. GymSkill
successfully assessed the quality of the exercises, in agreement with the
professional judgment provided by a physician. User feedback suggests that
GymSkill has the potential to serve as an effective tool for motivating
and supporting lay people to overcome sedentary, unhealthy lifestyles.
GymSkill is available in the Android Market as #x2018;VMI Fit #x2019;.
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