Low resting heart rate cause for concern?

34M. (Cis, white) I've had a fairly low resting heart rate of around 55bpm for a long time which I've always attributed to my consistent and intense weightlifting routine that used to include a lot of circuit training. For the past three months I've added in some modest running, 3km 2 to 3 times a week, occasional 5k at a pretty slow pace. Heart rate has slowed down to 43bpm as measured just now at rest. 34M. I take telmisartan 20mg a day for isolated systolic hypertension, though technically it's just prehypertension. Added in the running for heart health as I have a two year old and have been trying to be more conscientious about health lately. I was hoping to lower my BP naturally, not further lower my heart rate.