Is it bad to combine workouts like this?

[JoeX]

@teddorosheff

failing

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@teddorosheff

if there is any training rationale that might discourage me from doing something like this in the future?

Yes, working out to the point of failure is not the optimal way to train.

You need consistency and progressive overload to best stimulate adaptations that will make you faster. The easiest way to think about this imo is by thinking about tomorrows workout - will you be able to do it, or have you ruined yourself with todays workout.