To some people, fitness is everything. For Olympic trainees, it is important to spend hours a day staying fit. To others, it is a hobby, and to some it is excruciatingly hard work. Everyone who does it, though, will benefit. There is a difference between making it a priority and making it an obsession. Making getting fit a priority could mean everything. What you do is often determined by your ability to move around. For example, if you cannot move quickly then you might never be police officer. If you do not know how to move slowly and with agility, then you might not want to be a fire fighter.
It is not that you cannot do certain things if you are not fit. Some things will just be very difficult. To some people, getting down on the floor with their toddler is hard. Not everyone is unable to move quickly or with agility because they are not fit. Sometimes there are health issues. Sometimes however, it is fitness.
When it is your fitness level that is keeping you from doing what you desire to do, you need to do something about it. It will not take much to make a difference.