Some times the equipment is broken or doesn’t work as good as you like
The correct answer is D.
When designing a personal fitness program you should take into consideration what your goals are meaning what you want to realistically achieve, what activities you would like to do to get fitter and where and how you can do them and then create a variety of activities for yourself so you don't get bored and lose interest in your fitness plans.
Lack of red blood cell maturity causes the cell to be larger than normal and they carry oxygen inefficiently.
