Whether you prefer to work out first thing in the morning, during lunch, or after you leave the office, you'll work up a fine (mental) sweat every day of the year with these clever page-a-day calendars. The 2019 Mensa Brain Puzzlers Calendar offers 365 logic puzzles, spatial challenges, probability riddles, crosswords, and more, all sanctioned by Mensa and designed to test your intellectual mettle. The 2019 Mensa Crossword Calendar presents a year's worth of crosswords (for serious cruciverbalists) that are Mensa-level clever, but aren't so difficult you'll give up on your daily routine by mid-January!