
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.