You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use it? Really? All the scales? That’s what we thought.

Exercise is critical for your physical and mental health, but it’s harder to do if being outdoors seems unappealing or unsafe. And gym memberships can be pricey. The average monthly cost ($65) was up ...