Exhaustion

'Again!' I ordered myself in my thoughts the second I managed to land a proper strike on an imaginary opponent in front of me.

I couldn't care less for the exhaustion of my body. The mana that continued to rapidly infuse into my flesh would take care of that. 

'Again!' I thought, getting back into the fighting stance, driving the energy, and then pushing the spear forward. 

Once again, the shadow of a nearby tree that I was fighting with died a tragic death. 

But despite being killed by my spear countless times already, that bastard still refused to disappear!

'Again!'

Over and over again, I drove my spear in the exact same way, with the exact same muscles doing the job. 

Yet, even with all my efforts, the shadow was only turning bigger.