utilising gravity vs ground reaction

does anyone have any thoughts on these two philosophies?

force generation from the hip generating a powerful ground reaction which promotes a propulsive stride. does this require an upright torso?


using gravity as an accelerator to generate a reflexive stride. requiring a lean and robust vestibular system?

is this something that people have experience with or have observed? would it depend on the athlete, their anthmpometry and tissue preference?

Could you elaborate on "using gravity as an accelerator " ? Do you mean forward learn during acceleration ?

there’s an element of that but it isn’t restricted to acceleration. if you look at a lot of races / team sports, guys run fast at the start or in open play and they aren’t ‘tall’. it’s less lean than fall. the hip cycle and shin angle are almost there to catch them, rather than generate propulsion.