The participants in the eight-week yoga trial program in Canberra’s Alexander Maconochie Centre prison. July 17, 2019 First‑ever Australian study shows how yoga can improve the lives of prisoners Anthony Hopkins, Australian National University; Lisa Oxman, Australian National University, and Lorana Bartels, Australian National University Prisoners who took part in an eight-week yoga trial in a Canberra prison showed improvements in their levels of depression, anxiety and stress, as well as an increase in self-esteem.