Assertion: golfer's swing speed | /r/HasProperty | 70–79 mph
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Source sentences:
text: A regular flex shaft is generally appropriate for those with an average head speed (80–94 mph (129–151 km/h)), while an A-Flex (or senior shaft) is for players with a slower swing speed (70–79 mph (113–127 km/h)), and the stiffer shafts, such as S-Flex and X-Flex (Stiff and Extra-Stiff shafts) are reserved only for those players with an above average swinging speed, usually above 100 mph (160 km/h).