First of all, you need to spare a small amount of time on a daily basis from your deathly busy routine and consume this time in doing different types of exercises. Make sure you keep a record of how much time you consume in exercises which will help you to measure your fitness after a few weeks.
You should design a complete plan of exercise which will help you to achieve physical fitness in a systematic and organised manner.
Training program usually helps in improving and maintaining their physical fitness because you are doing exercises on a regular basis which will earn you general physical fitness.
Include different types of exercises in your fitness plan in order to make all of your body parts work equally. It will help you in gaining strength and fitness and no part of your body will remain weak.
Exercises will also help you to stretch all body parts and it will bring flexibility which is very essential in doing different types of exercises for getting perfect results.
You need to keep measuring the improvement in your fitness on weekly basis by sticking to the fitness program or plan. It will give you satisfaction that you are heading in the right direction.
With the passage of time, try to make the exercises a little hard by increasing your speed or increasing the time in exercises. It will help you to gain the higher level of general fitness and will also help to maintain it.
Always try your best to stay focused during exercises and do these exercises in the correct way which will bring you maximum results and you will gain general physical fitness without facing any trouble.