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These girls with muscles may inspire more than the muscular men out there.
Here's what has changed, and what has been learned.
With the right plan and the right discipline, you can get seriously shredded in just 28 days.
These training vets take "old man strength" to another level, and they have some wisdom to share.
Isometric-explosive body-weight jump squats increases lower body power, strength, and endurance. The exercise also increases core stability and coordination.
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