https://www.nytimes.com/2021/11/30/us/p ... biden.html (May be behind a paywall)
One of DC's most influential people uses an indoor rower:
"Washington has long been captivated by fallen star narratives, which has made President Biden’s national security adviser a figure of fascination, somewhere between sympathy and schadenfreude."
"Mr. Sullivan operated on an average of two hours of sleep a night for the duration of the three-week crisis in Afghanistan in August. He would mull over each long day during late-night walks home from the White House — his Secret Service detail trailed him — and often continue his meditations at home on a rowing machine."