Q: Is working out monday-friday and resting on saturday and sunday a good idea?

A: I'd try to split it up so you have a break every 2-3 days, assuming you're weight training. The way you're doing it, you're more likely to have subpar workouts by the time Thursday and Friday roll around because you're burnt out from so many weight training days in a row. Having said that, I know people who follow that schedule and have good success. So just pay attention to how you're feeling and how your workouts go and if you start sensing tiredness, restructure your schedule. I'd also advise to drop down to 3-4 workouts/week after some time. 5 is at the upper limit for most people. Do 2 months of 5-days-a-week and the 2 month of 3-days-a-week. After that you can go back to 5. Just vary it up a bit to let your body recover.