I set an income budget for myself in between what I make from the day job (nearly guaranteed income) and what I make online (variable income). (personalprofitability.com)
You can do it in between commercial breaks while watching TV, while doing a load of laundry, while the kids do their homework — anytime! (skinnyfit.com)
Keep rest to minimal or as you need it in between the exercises. (martamontenegro.com)