Beste AB-Übungen: Bauchtrainingsroutine für Kernkraft und eine flache
13,14 €
Best Ab Exercises is not like most abdominal workout books out there--in fact, it does not contain a single traditional "crunch" or "sit-up" type exercise. Indeed, the weakness in many workout routines that target your core is that a lot of those exercises work your stomach in near isolation.
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