Well, I was going to start my weight training on Friday but my son got sick so I was taking care of him all weekend... except for about 90 minutes on Saturday when I gave blood. I know they tell you not to lift anything over 5 lbs for the rest of the day (blew that one - the kid is 25 lbs), but how long should I wait after donating before doing a weight lifting workout? I am probably OK this time, but I donate blood about every 9 weeks so this would be good info to have then.