Thanks to all of you for confirming what my "instincts" told me: that one month post-treatment is too soon to embark on any additional physical effort. The Pilates I do with breast cancer patients is very gentle, activitating the small, deep muscles which provide stabilization for joints. It also provides mobilization for joints, and mindful stretching always working withing the range of motion appropriate for the person. If and when I do start working with my guy I will take the same approach, and start very slowly... in a few months time.
While I realize there is no "one size fits most" experience or path, it has been HUGELY helpful for me to read what your experiences are and have been like. Thank you for your willingness to share your experience and perspective. The gentleman I'm committing to work with is the husband of a long-time client who has become a friend. She asked me if I'd be willing to work with him, and of course I want to help in any way I can, if I can.
I'm glad you have this online community and wish you strength. the support of loved ones and a strong heart on your journey.
Debra