Yes, professional athletes do recovery. They spend time wi th baths, massages and take (legal) supplements to speed the whole process. They also train super intensively, they do not train for 12 hours a day.

If you are not tired after whole day of coding, then you was not coding intensively enough or did not had to solve difficult enough problems. Of course I can slowly hang around easy code for hours. It is different when you are trying to be as fast as possible and still not sacrifice the quality.