According to a personal trainer.
A trainer explains how to strengthen your core the right way.
The star is relying on this tough routine to stay fit.
The star enlists her inner circle to keep her motivated.
How to get a shredded midsection.
According to one top trainer.
According to science.
The singer is working hard to maintain her fit figure.
The star is praising his at-home exercise routine.
The star's tips for staying fit are surprisingly doable.
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