This might work if you don't have kids - I tried a four-day week like this so I could spend a day a week with my daughter in the years before she goes to school

This might work if you don't have kids - I tried a four-day week like this so I could spend a day a week with my daughter in the years before she goes to school, but I was so knackered by the day off that the extra day was an extremely low-quality one!