I am a former in shape-now out of shape male weighing 227lbs. Recently I bought a heart rate monitor and took off for a 5k run;
At an average pace of 6:27/km it felt challenging. I would not have been able to 'hold a conversation' and I felt like my saliva/swallowing was getting in the way of my breathing.
According the some online calculations I would have been in HR Zone 5 for about 98% of the run, which I have read is bad.
Do I just need to slow down, or is it possible I am running inefficient? It seems like I am already at just over walking pace...