It's absolutely better than nothing. If that's all you can do, keep doing it.
But it's far less than ideal.
Unfortunately, long, low intensity cardio (zone 2 on the order of 4 hours per week) is also incredibly important for longevity and health. You also ideally should be doing some kind of real strength training (e.g. barbells) for 1-3 hours per week for long term well being. A good maximum strength building program is usually going to require 30-60 minutes 2-3x a week. Muscle mass degradation is one of the most significant factors affecting quality of life in later age. You mitigate this decline by a) maximizing your potential in your youth and b) doing consistent maintenance work in your middle to late age.
Again, something is always going to be better than nothing. Sadly, our current society doesn't really allow for people to get an adequate amount of exercise, at least for many white collar workers with families.
But it's far less than ideal.
Unfortunately, long, low intensity cardio (zone 2 on the order of 4 hours per week) is also incredibly important for longevity and health. You also ideally should be doing some kind of real strength training (e.g. barbells) for 1-3 hours per week for long term well being. A good maximum strength building program is usually going to require 30-60 minutes 2-3x a week. Muscle mass degradation is one of the most significant factors affecting quality of life in later age. You mitigate this decline by a) maximizing your potential in your youth and b) doing consistent maintenance work in your middle to late age.
Again, something is always going to be better than nothing. Sadly, our current society doesn't really allow for people to get an adequate amount of exercise, at least for many white collar workers with families.