The maximum strength of your hand muscles.
It might sound simple, but the strength of your grip is one of the most reliable 'windows' into your overall muscle health and longevity. It reflects your body's total strength and has been linked to better heart health and independence as we age.
Clinicians use this to screen for 'sarcopenia' (natural muscle loss). Keeping your hands and forearms strong is a great proxy for keeping your whole body resilient.