How many times a week should you lift weights?

You should take a couple days off in between your training. The day you do not lift weights go swimming or do some cardio to keep your consistency and routine going. The reason you should not lift weights everyday is because muscle needs to rest in order to be built. You may not feel tired but your muscles need a day where you don't work them.

Lift weights Monday, Wednesday, Friday and Sunday and do more cardio on tues, thurs, sat. Or if you NEED to lift weights everyday focus on a different area each day. Work your arms one day only, then the next day your legs only etc etc. Get plenty of sleep and eat well.