I started walking 20 minutes a day, 5-6 days a week, for 2 weeks or so. I then added just a couple of minutes, total, of trotting, for about a week. I added a minute or so of trotting, each way, every 3 days or so. Once I was at about 45 minutes, total, with the same 20-25 minutes of walking, I backed down to 30 minutes, replaced a few minutes of trotting with cantering, and worked back up to the 45-60 minutes total. When you increase intensity, decrease the time - golden rule. If you want to go a bit longer because it's a beautiful day, back off the intensity
