You can do HIIT in many low-impact sports. Swimming comes to mind, but there are plenty of great high intensity sports which work with agin bodies. Most coasta

You can do HIIT in many low-impact sports. Swimming comes to mind, but there are plenty of great high intensity sports which work with agin bodies. Most coastal areas probably have outrigger paddling clubs or dragon boats or crew. I can't recommend outrigger canoe paddling enough.