Somersaults, Throwing, and Hitting Motions 256
9.1 Introduction 256
9.2 Time Derivatives of Vectors 257
9.3 Angular Velocity and Angular Acceleration 258
9.4 Conservation of Angular Momentum 264
9.5 Dancing Holding on to a Pole 271
9.6 Rolling of an Abdominal Wheel on a Horizontal Plane . . . . 275
9.7 Biomechanics of Twisting Somersaults 280
9.8 Throwing and Hitting Motions 283
9.9 Summary 287
9.10 Problems 289
Appendix 1 Units and Conversion Factors 297
Appendix 2 Geometric Properties of the Human Body 299
Selected References 304
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.