Hamstring curls (either on a machine or swiss ball) are one of my favorites to add into the rehab mix to get the hamstrings going soon after a hamstring strain, or after 6wks post-op ACLR (hamstring graft).
So in the event you don't have gym access or a swiss ball, but you have a foam roller, here's an alternative for you. You're welcome!
If you're looking to learn more about rehabilitation, make sure you're following www.learn.physio as we've got plenty of FREE and paid content available to watch to improve your clinical skills and exercise prescription