Depends on the intensity and number of sets etc.....
For the purpose of building muscle, if he's working to failure every day then it's a bad idea. He's not allowing his muscles to rest. Without rest they won't grow.
For endurance purposes, providing he isn't going anywhere near failure (i.e working between 50%-65% of his max rep range) then it's ok......but even then he would require a rest every now and again.


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