May i share my experiences... Running and healthy diet (with IF) is my 1st priorities than play badminton at the begining, coz, im suffering on court when opposed with higher level especially (out of steam). And my 1st objective for this sport is to be more healthy and fun sports (not to become an athletes) But, i did it too much than play badminton. It cause me overtrain, and can't perform well on court instead. So, i change my training plan (after covid lockdown), i playing badminton more on court (2 or 3 times a week) quit running, balance diet (maintain BMI 22), and home workout for muscle from head to toe regime two times a week. Imo... badminton is already kind of cardio workout, so no need more (pro player is different case), and for recreational player like me, just need a bit to maintain muscles strength to avoid injuries and confident on court. And a little secret and tricky in badminton. Do not follow the fast PACE opponents playing rhythm (higher level than us), choose your team (if play double) and opponents level wisely, that would make you enjoy more badminton (and feel competitive ). Rather than pushing our limit, and train hard like an athlete. its more than enough for my ages to keep playing fun with level C and D only. (Level B is a coach level ... imo). everyone level & goals is different.