These days, multitasking is important. You can't just work while you work. You also need to work out while you work. And while you're working and working out, you also need to make sure to stay nourished and hydrated. But hey! While you're working and working out and staying hydrated, that still leaves one hand free for some fun activities like crossword puzzles and games on your smartphone. Doesn't it feel great to get stuff done?