@online{olson,
  author = {Olson, Dieter},
  title = {Drift {Is} the {Past,} {Control} {Is} the {Present:} {A}
    {Lay} {Guide} to {Momentum} and {Muscle}},
  date = {},
  url = {https://affinedrift.com/articles/drift-is-the-past-control-is-the-present.html},
  langid = {en},
  abstract = {Every golfer wonders how much clubhead speed comes from
    muscle power versus letting the club swing. At a single frozen
    instant, total acceleration splits into drift and control. This
    article explains the ZTCF family and ZVCF, reconciles them with
    active and passive coaching concepts, and details why snapshot
    decomposition cannot simply be integrated over time.}
}