This is how to test how fit you actually are You're in safe hands with advice from five top PTs Jan 3, 2021 of course. You'll probably be extra keen to know if you work out regularly and feel like you've made progress in the last few months. Physical fitness, according to Lucie Cowan, Third Space master trainer, isn't just your school beep test or how fast you can sprint 400 metres: rather, it's a general state of health and wellbeing that encompasses a whole spectrum aspects, from resistance training, to mobility, to flexibility, to core strength, to cardio fitness, to mental wellbeing.