Richardson had been forced to miss practice because of pneumonia, according to Vic Tafur of the San Francisco Chronicle.
"This is probably the most eager I've been going to practice in a long time," Richardson said Thursday. "I've been sick. Lot of people saying something about I was overweight. I was nowhere near being overweight. I actually came in around 220, 222."
Richardson needs a strong camp and preseason to prove he's a worthy reclamation project. Getting back on the field is a vital first step.