We all enjoy some amount of free will within the orbit of predetermination, not outside it. If free-will was non-existent, the great sage Parashara whose magnum opus on astrology, Brihat Parashara Hora Shastra, we depend on, would not have prescribed remedial measures like doing Vishnu Sahasranamamor doing charities etc. You have seen my own example. I could not walk in the years 2000-2001 without a support walker. No doctor could diagnose my disease and therefore no treatment was possible. I did Vishnu Sahasranamam regularly and with God's grace, I can now walk without the walker (even though I still use a walking stick for safety).
reprinted with permission