I Exercise Regularly

I was sprinting down the road for like 20 seconds, then walking back, taking a break for like 2 minutes, increasing the break from 2 minutes to 2:40 minutes after the third round, then around 3 minutes last two rounds--6 rounds, although I'm not sure if I was still sprinting towards the end. Felt like I had an ab and a calf workout. That was my cardio for the day.