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Exercise equipment can be expensive. So is a gym membership—if you make time to go to the gym, that is. When you do make an effort to work out, there's often a line for your favorite machine—which would be fine if you didn't need to be back at work in an hour. Crunches and lunges don't require any equipment, but boy do they get tedious. Luckily, there are plenty of ways to sneak a little exercise into your daily routine without spending your hard-earned money on home equipment or gym memberships.