u/If_wall

Context: 59M, regular hiker and jogger until 5 months ago when an erratic heartbeat led to ECG and subsequent 2D Echo found 25% EF. Arteries found clear, hence I have non-ischemic DCMP. No other symptoms.
Started the usual HF medication at low doses coz to avoid excessive drop in BP.
Arrhythmia disappeared in 3 weeks.
5 months later, my EF hasn’t improved, but I walk 3-5km and swim 200m daily without exceeding 120HR.
The meds obviously keep me relatively lethargic throughout the day.
Question: can I resume moderate hiking, taking care to control HR below 125?