As a second opinion, everyone is different. This is quite literally the last advice I would give anyone starting out. Short high effort intervals and spiking HR for someone with poor cardiovascular strength (myself 12 weeks ago) feels like absolute horrid shit and I would never want to go to the track again.
Prioritize enjoying the run. Which you can’t do when your body thinks you might be having a heart attack.
Prioritize enjoying the run. Which you can’t do when your body thinks you might be having a heart attack.