Cyn i Tendon Manager ddod ar y farchnad, y ffordd orau o ganfod pa mor gyflym yr oedd cyhyr yn oeri oedd wrth i'r hyfforddwr redeg ei law drosto.  Gall yr hyfforddwyr gorau ganfod gwahaniaeth mewn tymheredd o tua tair gradd, ond gall Tendon Manager ganfod gwahaniaeth o ddim ond 0.2 gradd.
Before Tendon Manager was brought to the market, the best way of judging muscle cool-down was by having a trainer use their hands to assess the cool-down rate. The very best trainers can detect a difference in temperature of around three degrees, but Tendon Manager can detect differences of just 0.2 degrees.