Isnt that just a fancy way to say "work your dorsiflexion muscles"?
highly unlikely that anybody needs grip strength
. Research has now shown that grip strength has proven to be a reliable indicator for quality of life at an older age. For instance, in 1999 a study concluded the following:
“Among healthy 45- to 68-year-old men, hand grip strength was highly predictive of functional limitations and disability 25 years later. Good muscle strength in midlife may protect people from old age disability by providing a greater safety margin above the threshold of disability.”