If You Can Do This Many Sit-ups After 55, Your Arm Core Endurance Is Elite

Core strength gets plenty of credit for protecting your back and improving posture, but core endurance often matters just as much once you pass 55. Endurance reflects how long your core muscles can stay engaged while supporting your spine and transferring force. That ability shows up every time you walk uphill, carry groceries, get out of bed, or stay upright during long periods of standing or sitting. When endurance fades, fatigue sets in fast, and movement quality usually follows.

Strength and endurance aren’t interchangeable. Strength reflects how much force your core can produce in a short burst. Endurance reflects how long those muscles can keep working without losing control. After 55, endurance tends to decline faster t...