On the treadmill yesterday, going nowhere at 3.4 miles per hour, I was thinking about the ages and stages of my workout/ life balance. I know women my age who absolutely live for the gym, who tell me how much I would love cycling class if only I would just try it. My workout goal is to get in, get out, and over to Starbucks for a Venti Decaf Iced Americano. No cycling required.
Watching the women in their 30s to 70s around me, some on the elliptical, others running next to me, I was flashing back to my single 20s and early 30s – hanging out at the Downtown Athletic Club all sweaty doing aerobics in my black leotard and tights. 
As a young mother, I moved on to an uptown club for sculpting classes and workouts with my first trainer. In my 40s, I landed at this all-female gym, a place with great childcare, where I could show up in sweatpants and oatmeal stains on my shirt, which is exactly what I did yesterday after dropping my son off at school.
About 10 minutes in, I was thinking about how much exercise we really need to stay healthy and alert as we age, and an image popped into my head. Researchers had put rats into cages with running wheels to discover the connections between the intensity of various workouts and the creation of new brain cells in the “mature brain.” Surprisingly, according to a recent article about the research, almost all the rats seemed to gain some benefit, even those that were just “slowly skittering” about.
When I was done, I checked my stats: 1.2 miles, 100 calories; nothing to boast about but I still felt fine. Whatever the intensity, I was living at my own pace. Come springtime, I will be off the treadmill without feeling guilty, intensely happy to be out of the gym and back walking in the sunshine.
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