205. Automated Weight Lifting Coach

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205. Automated Weight Lifting Coach

CATEGORY: Fitness, Workout & Exercise 500 Courses

COURSE NUMBER: 01

FEES: 555/- INR only

CERTIFICATE VALIDITY: Lifetime

CERTIFICATES DELIVERY: In 48 hours

Syllabus

List of Tables ix
List of Figures x
1 Introduction 1
1.1 Contributions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Domain Background 3
2.1 Benefits of compound exercise . . . . . . . . . . . . . . . . . . . . 3
2.2 Benefits of barbell exercise . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Benefits of compound barbell exercise . . . . . . . . . . . . . . . . 5
2.4 Weight lifting technique . . . . . . . . . . . . . . . . . . . . . . . 7
2.4.1 Back Squat . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4.1.1 Correct technique . . . . . . . . . . . . . . . . . . 10
2.4.1.2 Incorrect technique . . . . . . . . . . . . . . . . . 11
2.4.2 Bench Press . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.4.2.1 Correct technique . . . . . . . . . . . . . . . . . . 16
2.4.2.2 Incorrect technique . . . . . . . . . . . . . . . . . 17
2.4.3 Overhead Press . . . . . . . . . . . . . . . . . . . . . . . . 20
2.4.3.1 Correct technique . . . . . . . . . . . . . . . . . . 20
2.4.3.2 Incorrect technique . . . . . . . . . . . . . . . . . 20
2.5 Weight lifting technique feedback . . . . . . . . . . . . . . . . . . 23
2.5.1 Visual feedback . . . . . . . . . . . . . . . . . . . . . . . . 24
2.5.2 Wearable devices . . . . . . . . . . . . . . . . . . . . . . . 26
3 Technical Background 30
3.1 How device sensors work . . . . . . . . . . . . . . . . . . . . . . . 30
3.1.1 Accelerometer . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.1.2 Gyroscope . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.1.3 Magnetometer . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.2 Combining sensor data together . . . . . . . . . . . . . . . . . . . 36
3.3 How data classification systems work . . . . . . . . . . . . . . . . 39
3.3.1 Decision tree . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.1.1 Decision Tree Algorithm . . . . . . . . . . . . . . 41
3.3.1.2 Classifier Evaluation . . . . . . . . . . . . . . . . 43
3.3.2 Random forest . . . . . . . . . . . . . . . . . . . . . . . . 44
3.3.3 Extra-tress . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4 Related Work 48
4.1 General motion tracking systems . . . . . . . . . . . . . . . . . . 48
4.2 Systems used to augment healthcare . . . . . . . . . . . . . . . . 49
4.3 Systems used to augment general exercise performance . . . . . . 50
4.4 Systems used to augment weight lifting performance . . . . . . . . 51
5 Methodology 54
5.1 Barbell Lifts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.2 Subject testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5.2.1 Profile of subjects . . . . . . . . . . . . . . . . . . . . . . . 55
5.2.2 Realistic technique deficiencies . . . . . . . . . . . . . . . . 56
6 Implementation 57
6.1 Data collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2 Technique classification . . . . . . . . . . . . . . . . . . . . . . . . 60
6.3 Automated weight lifting coach . . . . . . . . . . . . . . . . . . . 63
7 Experimental Framework 65
7.1 Research protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
7.2 Validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8 Results 67
8.1 Squat results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.2 Bench press results . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.3 Overhead press results . . . . . . . . . . . . . . . . . . . . . . . . 76

9 Analysis 85
9.1 Research study bias and error . . . . . . . . . . . . . . . . . . . . 85
9.2 Athlete bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9.3 Technique deficiency challenges . . . . . . . . . . . . . . . . . . . 86
9.4 Researcher error . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
9.5 Overcoming research study bias and error . . . . . . . . . . . . . 87
9.6 Technical error considerations . . . . . . . . . . . . . . . . . . . . 87
9.6.1 Orientation taring . . . . . . . . . . . . . . . . . . . . . . . 87
9.6.2 Magnetometer effects . . . . . . . . . . . . . . . . . . . . . 88
9.6.3 Euler angles and Gimbal lock . . . . . . . . . . . . . . . . 90
9.6.4 Data collection rate . . . . . . . . . . . . . . . . . . . . . . 91
9.6.5 Exercise technique deficiency ambiguity . . . . . . . . . . . 92
10 Conclusions 93
11 Future Work 94
11.1 Visual feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
11.2 Repetition detection . . . . . . . . . . . . . . . . . . . . . . . . . 95
11.3 Sensor compatibility . . . . . . . . . . . . . . . . . . . . . . . . . 95
11.4 Body type clustering . . . . . . . . . . . . . . . . . . . . . . . . . 96
11.5 Female study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
11.6 Alternative ways to provide weight lifting feedback . . . . . . . . 97
Bibliography 98

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