Many people on here, myself included, have been intermittent fasting every day, or mostly every day for years. I’m on year three - and I burn about 1000 calories a day through exercise (powerlifting and aerobics/running) - frequently working out in a fasted state to no ill effect. Some people do follow on/off cycles in a week, but I personally find it much easier with daily consistency. You can follow whatever eating program you want in addition, IF is really just about when you eat, not what/how much you eat.