I've been working out, really this time, for about a week now and lost about 4lbs. Is this too fast? Pretty much Sat. and Sun I worked out for about 3hrs on both days. I took a break Mon and Tues because my leg and shoulders were sore, and got back on it Wed working out for an hour in the morning then 2 hours of vigorous workout. Weighed myself today and am 4lbs lighter. I've read to expect about 1lb every week for my size; but could losing weight too fast be bad? I do a combination of aerobic and anaerobic exercises, although the aerobic exercises are usually with weights or resistance. And FYI, I gained about 30lbs since mid-December.