Je onderrug trainen, veel mensen willen een sterkere onderrug. Maar moet je je onderrug trainen om je onderrug sterker te maken? Zijn geïsoleerde oefeningen de beste oefeningen voor een sterke onderrug? Moet je aan andere dingen denken als je een zwakke onderrug hebt? Bij verschillende spiergroepen in het hele lichaam hebben mensen vaak fysieke klachten,…
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