[mathattack]

I hear you - gym memberships are a great benefit because they save the employee money, and pay for themselves in better health.

Any perk that gives me time back is a good one, whether or not I invest the time in the office or elsewhere. I'd rather play with my kids than fold clothes.

Personally I find my productivity increases up to about 50 hours, and then drops slowly until about 60, when it falls off the cliff. Different people hit it at different times.