Hit me with your crazy fitness challenge ideas

[Captain_Doughnutman]

The study:

Effects of a Seven Day Overload-Period of High-Intensity Training on...

The discussion thread:

VO2max vs sprint training

Listening to various podcast on my long commutes every day. Heard on one of the podcasts that doing sprint training has a negative affect on VO2 max and vica versa. This is the first time I’ve heard this mentioned and it seems a bit odd to me that the one would negatively affect the other. Thoughts?