I totally agree with what phil said but would like to add one thing. Assuming you didn’t actually injure yourself (read that again, it’s important), doing a light chest workout a day or two after a heavy one will most likely help relieve soreness.
If I’m really sore after a heavy workout, on my rest day I’ll go to the gym and do a nice easy 10 or 15 minutes on either the rower, cross trainer, or elliptical (I like the upper body movement involved, swimming would also be great if you have access to a pool. I tend to avoid running when not at rugby as I get killer shin splints).
After that I’ll hit the weights for a nice and quick, light full body workout. Never going even remotely heavy, but using enough weight to at least provide some resistance (squatting the bar ain’t gonna do it here, but 50-60% max is probably enough).
This is also a great time to experiment with a new exercise or check your form with lighter weights. I’ll usually finish up with some nice relaxing stretching. All total I probably spend no more than half an hour or 45 minutes in the gym, but it really seems to help the recovery.
Note that this is not a workout, I’ll get warm, break a light sweat, and get the blood moving a bit, but by the time I’m showered and leaving the gym I should just feel refreshed, not like I just exercised. Also, don’t let this replace all your rest days. Sometimes the body, and mind, just need a day to veg out on the couch watching sports and not moving except to get another beer, grab some food, or take a leak.