It's a reminder of when I was 50 lbs overweight, with swollen calves/ankles (cankles -- you can't tell where the calves end and ankles begin) after being on my feet all day for a few days. Congestive heart failure and diabetes run in my family, mostly due to diet and sedentary lifestyle.
I changed my diet, started exercising again and lost 55 lbs gradually over 10 years, most of it after resuming cycling in 2015. But I kept the old moniker as a reminder.