Low intensity endurance exercise is not as effective as moderate intensity endurance exercise for posting fitness.

Low ? intensity workout, might be appropriate for those who have impaired health or cardiac disease, but not for healthy middle aged subjects, like the majority of those who come and ask for preventive exercise.

How true does the above mention thought holds true to you?

I either work out hard or don't work out at all, no point and having low intensity especially because I'm not even close to being middle-aged