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Elke fitness goeroe zal het zeggen: sterke buikspieren zijn superbelangrijk. En gelijk hebben ze: de spiergroepen rond je wervelkolom verdienen je aandacht. Betekent dit dan dat je elke dag crunches moet doen? Gelukkig zijn er ook andere manieren om sterkte buikspieren te kweken. Het blijkt dat het staand trainen van je niet alleen veel prettiger […]