Increase Flexion - Tips?

Hey all,

I saw a post the other day where many had great tips but I can't find it now.

I'm 4 weeks post op and trying to increase my flexion. I'm having trouble getting past 70°. Tomorrow, my PT is scheduled and my Physical Therapist said we'd be pushing it and I'll be in discomfort, but we have to get this knee moving more.

Soooo.. I'm doing my PT exercises at home, I'm massaging my leg muscles, what else has worked for you?? My biggest area of stiffness is at the back of my leg, right where my leg bends. I've been placing a tennis ball there and stretching and massaging it. Please share what has worked for you! I know it's going to be somewhat painful, but I need to get this knee bending more.

Thank you for input!!