EMBRACE: Exercising Together

This study tests a couples-based exercise program called EMBRACE for people with prostate or breast cancer who are about to undergo radiation therapy. The program involves exercising together with your partner via video calls, aiming to improve physical and emotional wellbeing for both of you. **You may be eligible if...** - You have prostate or breast cancer (not spread to other organs) and are scheduled for radiation treatment with intent to cure - You live with an intimate partner or spouse who is willing to join the study with you - Both you and your partner are 18 or older - Neither you nor your partner currently does structured strength training for more than 30 minutes twice a week - You have internet good enough for video calls **You may NOT be eligible if...** - You or your partner have cognitive difficulties that prevent participating in exercise or completing surveys - You or your partner have a medical or movement condition that makes moderate exercise unsafe Talk to your doctor to see if this trial is right for you.