>>75734181
>I can easily do a dozen sets of any upper body exercise

Your upper body myscles are tiny compared to your legs.

>The fatigue is also immense.
Normal.

>is there anything I can do to combat it, other than just pure extreme will power,

Uh, lower the load, longer rests, less gym sessions?
If you need even more willpower to workout once you are already at the gym, something is teribly wrong

>Since my muscles aren't the issue
They clearly are you idiot.
Weak muscles => Greater fatigue.

>will [cardio] that make a difference?
No. To get better at cardio, you do cardio. To get better at squats, you do squats.

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Will cardio make leg days easier?