NEW YORK (AP) — Tom McGee began climbing stairs for exercise 20 years ago as part of an effort to stay off cigarettes. It hasn’t always been easy: His climbs in hotel stairwells sometimes draw the attention of security guards. “I’ve gotten kicked out of about every hotel in the city,” said McGee, a 69-year-old market researcher who lives near Chicago. Climbing stairs has become increasingly ingrained in exercise guidance, but many people who do it regularly say it can be challenging in an era