Body-training exercise apparatus, namely, a flexible spring-mass device for muscle development to improve swing performance. Sports training exercise apparatus, namely, a flexible spring-mass device for increasing swing performance of a sports implement. Baseball and softball exercise and training apparatus, namely, a flexible spring-mass device used for batting swing performance development

'apparatus':5,23,45 'basebal':39 'bat':55 'bodi':2 'body-train':1 'develop':15,58 'devic':12,30,52 'exercis':4,22,42 'flexibl':8,26,48 'implement':38 'improv':17 'increas':32 'mass':11,29,51 'muscl':14 'name':6,24,46 'perform':19,34,57 'softbal':41 'sport':20,37 'spring':10,28,50 'spring-mass':9,27,49 'swing':18,33,56 'train':3,21,44 'use':53

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