 Moodys Investors Service, Moodys today downgraded Tivitys Heath, Incs Tivity Corporate Family Rating CFR to B3 from B1 and its Probability of Default Rating to B3-PD from B1-PD. At the same time Moodys downgraded the companys secured credit facilities to B3 LGD4 from B1 LGD 4. 