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The first step to Be Your Own Strength Hero is knowing your muscle age

Follow Ji Jin Hee in discovering your strength.

How Strong Are You?
Let's Check Your Muscle Age!

How to test your muscle strength?

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Step 1

Choose a suitable chair.
The height of the chair should be approx. 43cm.

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Step 2

Use a timer to time yourself doing the Stand4Strength challenge.
Sit-to-stand on both legs 5 times with arms folded as fast as you can.

For your own safety

  • Be careful not to strain or injure yourself.
  • Stop challenge immediately if your knees start to hurt.
  • Don’t lean back to gain momentum or you may topple backwards.
  • Do the test when you have a friend or family member around to support you.
  • Do not try the test if you have had a recent fall or injury.

Step 3

Enter your details in the muscle age calculator below.

Sit-to-Stand Time (e.g. 7.5 seconds)

Required time in seconds Invalid numbers

Your Result




*Muscle Age is an indication of the strength and performance of the muscles in the lower limbs, and is calculated based on the 5-times sit-to-stand test which matches test time with specific biological age groups.Results are based on Caucasian age norms.

Bohannon R et al. Isokinetics and Exercise Science 15 (2007) 77–8

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