Trained athletes recirculate lactate during exercise at 65% VO2 Max to support blood glucose, unlike untrained individuals at the same relative intensity.

“now when uh a highly trained athlete exercises and here we need to talk about relative or absolute power output so let's say 65% of V2 Max or 65 % of effort for an untrained person well that's not very much exercise really they'll get to 65% of V2 Max a very low power output now we take the trained athlete put him or her at their 65% they're generating a lot of lactate but they're burning it and as you described earlier it's recirculating to the core recycle to support blood glucose”