Weight Lifting and exercise with hypertrophic cardiomyopathy: Tips?

At 52 ish HOCM was discovered and my surgeon cut out some excess muscle out of my heart and changed out a valve. He made a mitro valve choice that 4 years later had to be redone/open heart again. All to say- not a lot of working out/exercise in the last 10 years. For 5 years I have been trying to find info on exercise with HCM. My cardiologist- who I do love- just keeps saying “go live life”. It is encouraging. And it isn’t. Still a bit tired and gasping for air on inclines. (Heart?! Out of shape?)
There are plenty of days where I feel my heart beat and it feels like a full body quake that others can see! (They can’t) (heart)
My question~
The other day, to encourage a friend, I went to
“The exercise coach” for three sessions.
It is a program of 20 min 2 x week pretty intensive weights.
Am I doing damage?
I am exhausted after for a day or two .
(Heart? Or out of shape?)
I watched my heart rate last time I went, it stayed under 100bpm.
After the second open heart surgery, I was walking and doing small weights and changed my diet (which really wasn’t too bad already). It has almost been a year and have had some movement toward better shape. But it has been a year. I want to live life being much more active and strong.
After three sessions of this program I could see an actually difference and would like to keep going.
Fairly competitive – and the computer allows you to push above the last time you were there while on each machine. Good or bad?!
Is there ANY reading out there for HCM on exercise that is acceptable, accurate, helpful? I have asked for 6 years. All I get is “don’t google” but I figure the Mayo Clinic is a place I can go~. Thanks
Anny