I have been suffering with panic attacks for the past month and a half and rejoined the gym about three weeks ago. I was guided by my cardiologist to "do what was comfortable" so I started by simply walking five times a week on the treadmill at a speed of 3.0. I have since increased my speed gradually to 3.4 adding a light weights circuit to my workout. This has been a comfortable workout for me and I monitor my heart rate regularly on the treadmill. I am wondering though when I could resume my normal workout e.g. spinning, kickboxing. After my workout my heart rate still remains around 95 -100 beats per minute for a long time, so I don't want to do anything that is dangerous to the heart. I have been on Lopressor for the past 5 weeks and this has helped to lower the heart rate considerably. Any advice?