If you are going to cheat, don't forget to slip off your Fitbit along with your drawers.
NFL Network correspondent Jane Slater says she caught a former boyfriend cheating after spotting a suspiciously rapid increase in his heart rate and physical activity at 4 a.m. on their shared Fitbit app.
The ex had given her the Fitbit as a Christmas gift so they could track each other's activity levels and motivate each other to exercise more. Slater says she didn't hate it until "he was unaccounted for at 4 am and his physical activity levels were spiking on the app."
"Wish the story wasn’t real,” Slater wrote in a post which has been retweeted more than 46,000 times and has more than 470,000 likes. She added: "Spoiler alert: he was not enrolled in an OrangeTheory class at 4am."
An Ex Boyfriend once got me a Fitbit for Christmas. I loved it. We synched up, motivated each other... didn’t hate it until he was unaccounted for at 4am and his physical activity levels were spiking on the app 🥴wish the story wasn’t real. https://t.co/npRkLJYYz0— Jane Slater (@SlaterNFL) December 5, 2019
Making the experience even more painful, Slater, at the time, was preparing to celebrate his birthday. "I was at his home w balloons ahead of the birthday I planned the next day." She was so concerned about where he was, she even contemplated calling the police.
"My girlfriend once said 'one day we will laugh about this' as I sobbed uncontrollably in the car," she tweeted. "I have now many times bahahahah."
Slater's followers chimed in with their own tales of infidelity outed by fitness trackers.
"My ex-husband got caught in an affair because he was wearing the training watch and heartbeat monitor my mom bought him for Christmas — while ‘running,’” @carey_gibbons wrote. “It was the under-one-minute heart rate spike that confirmed things for me! #prematuresayswhat.”
Jane! My ex husband got caught in an affair because he was wearing the training watch and heartbeat monitor my mom bought him for Christmas - while “running”. It was the under-one-minute heart rate spike that confirmed things for me! #prematuresayswhat— cooey (@carey_gibbons) December 5, 2019
Sexual activity does register on fitness trackers, Alex Koch, professor of exercise science at Lenoir-Rhyne University in North Carolina, told Business Insider.
Fitbits and other devices have accurate heart rate monitors that detect spikes including those brought on by intimate moments. Fitbits also have an accelerometer, which detects vibrations from movement.
"There's definitely going to be a substantial rise in heart rate from resting, depending on how energetic you are," he said.
But don't just assume your partner's having an affair. Fitness trackers can't distinguish between sexual activity and other forms of cardio, Koch said.
This article originally appeared on USA TODAY: Fitbit: Jane Slater says she caught ex boyfriend cheating with fitness tracker