Illustration by Nishant Choksi

I was at an Italian restaurant in Melbourne, listening as a woman named Lesley talked about her housekeeper, an immigrant to Australia who earlier that day had cleaned the bathroom countertops with a bottle of very expensive acne medication: “She’s afraid of the vacuum cleaner and can’t read or write a word of English, but other than that she’s marvellous.”

Lesley works for a company that goes into developing countries and trains doctors to remove cataracts. “It’s incredibly rewarding,” she said as our antipasto plate arrived. “These are people who’ve been blind for years, and suddenly, miraculously, they can see again.” She brought up a man who’d been operated on in a remote area of China. “They took off the bandages, and for the first time in two decades he saw his wife. Then he opened his mouth and said, ‘You’re so . . . old.’ ”

Lesley pushed back her shirtsleeve, and as she reached for an olive I noticed a rubber bracelet on her left wrist. “Is that a watch?” I asked.

“No,” she told me. “It’s a Fitbit. You synch it with your computer, and it tracks your physical activity.”

I leaned closer, and as she tapped the thickest part of it a number of glowing dots rose to the surface and danced back and forth. “It’s like a pedometer,” she continued. “But updated, and better. The goal is to take ten thousand steps per day, and, once you do, it vibrates.”

I forked some salami into my mouth. “Hard?”

“No,” she said. “It’s just a tingle.”

A few weeks later, I bought a Fitbit of my own, and discovered what she was talking about. Ten thousand steps, I learned, amounts to a little more than four miles for someone my size—five feet five inches. It sounds like a lot, but you can cover that distance in the course of an average day without even trying, especially if you have stairs in your house, and a steady flow of people who regularly knock, wanting you to accept a package or give them directions or just listen patiently as they talk about birds, which happens from time to time when I’m home, in West Sussex, the area of England that Hugh and I live in. One April afternoon, the person at my door hoped to sell me a wooden bench. It was bought, he said, for a client whose garden he was designing. “Last week she loved it, but now she’s decided to go with something else.” In the bright sunlight, the fellow’s hair was as orange as a Popsicle. “The company I ordered it from has a no-return policy, so I’m wondering if maybe you’d like to buy it.” He gestured toward an unmarked van idling in front of the house, and seemed angry when I told him that I wasn’t interested. “You could at least take a look before making up your mind,” he said.

I closed the door a couple of inches. “That’s O.K.” Then, because it’s an excuse that works for just about everything, I added, “I’m American.”

“Meaning?” he said.

“We . . . stand up a lot,” I told him.

“Oldest trick in the book,” my neighbor Thelma said when I told her what had happened. “That bench was stolen from someone’s garden, I guarantee it.”

This was seconded by the fellow who came to empty our septic tank. “Pikeys,” he said.

“Come again?”

“Tinkers,” he said. “Pikeys.”

“That means Gypsies,” Thelma explained, adding that the politically correct word is “travellers.”

I was travelling myself when I got my Fitbit, and because the tingle feels so good, not just as a sensation but also as a mark of accomplishment, I began pacing the airport rather than doing what I normally do, which is sit in the waiting area, wondering which of the many people around me will die first, and of what. I also started taking the stairs instead of the escalator, and avoiding the moving sidewalk.

“Every little bit helps,” my old friend Dawn, who frequently eats lunch while hula-hooping and has been known to visit her local Y three times a day, said. She had a Fitbit as well, and swore by it. Others I met weren’t quite so taken. These were people who had worn one until the battery died. Then, rather than recharging it, which couldn’t be simpler, they’d stuck it in a drawer, most likely with all the other devices they’d lost interest in over the years. To people like Dawn and me, people who are obsessive to begin with, the Fitbit is a digital trainer, perpetually egging us on. During the first few weeks that I had it, I’d return to my hotel at the end of the day, and when I discovered that I’d taken a total of, say, twelve thousand steps, I’d go out for another three thousand.

“But why?” Hugh asked when I told him about it. “Why isn’t twelve thousand enough?”

“Because,” I told him, “my Fitbit thinks I can do better.”

I look back at that time and laugh—fifteen thousand steps—Ha! That’s only about seven miles! Not bad if you’re on a business trip or you’re just getting used to a new prosthetic leg. In Sussex, though, it’s nothing. Our house is situated on the edge of a rolling downland, a perfect position if you like what the English call “rambling.” I’ll follow a trail every now and then, but as a rule I prefer roads, partly because it’s harder to get lost on a road, but mainly because I’m afraid of snakes. The only venomous ones in England are adders, and even though they’re hardly ubiquitous, I’ve seen three that had been run over by cars. Then I met a woman named Janine who was bitten and had to spend a week in the hospital. “It was completely my own fault,” she said. “I shouldn’t have been wearing sandals.”

“It didn’t have to strike you,” I reminded her. “It could have just slid away.”

Janine was the type who’d likely blame herself for getting mugged. “It’s what I get for having anything worth taking!” she’d probably say. At first, I found her attitude fascinating. Then I got vindictive on her behalf, and started carrying a snake killer, or, at least, something that could be used to grab one by the neck and fling it into the path of an oncoming car. It’s a hand-size claw on a pole, and was originally designed for picking up litter. With it I can walk, fear snakes a little less, and satisfy my insane need for order all at the same time. I’ve been cleaning the roads in my area of Sussex for three years now, but before the Fitbit I did it primarily on my bike, and with my bare hands. That was fairly effective, but I wound up missing a lot. On foot, nothing escapes my attention: a potato-chip bag stuffed into the hollow of a tree, an elderly mitten caught in the embrace of a blackberry bush, a mud-coated matchbook at the bottom of a ditch. Then, there’s all the obvious stuff: the cans and bottles and great greasy sheets of paper that fish-and-chips comes wrapped in. You can tell where my territory ends and the rest of England begins. It’s like going from the rose arbor in Sissinghurst to Fukushima after the tsunami. The difference is staggering.