https://www.eatthis.com/plank-hold-core-strength-test-over-forty/
https://www.eatthis.com/plank-hold-core-strength-test-over-forty/
WWW.EATTHIS.COM
If You Can Hold a Plank This Long at 40+, Your Core Is Exceptionally Strong
Over 40? If you can hold a plank this long with perfect form, your core strength is top-tier. See where you stand.
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