[quote=@Techspert]
<Snipped quote by Darlit Glitch>

That's the point of the last statement. It's being stuck between a rock and a hard place when you can't keep pushing yourself without becoming inefficient, but not doing anything productive is wasting time.
[/quote]

Then try finding something relaxing to do.
That way your at least doing something while letting your body recover, and that means not going full throttle on the activity.