I just love staying physically fit.  There is nothing else like feeling in shape.  Fit people can better perform physical task like sports.
It feels good afterwards. That good sore you feel through your body. Do you know a lot of being physically fit?
Yes you must achieve fitness through repeated exercise and a good diet.
what are some of the best exercises? Walking is my favorite because I can sight see while I walk
Bodyweight exercises do a very good job.  They don't use any outside weights and just use the weight of your body.
That's cool, like squats and push ups? Never been fond of them but I can do it.
Yes most of the exercises are simple abilities such as pulling pushing or squatting.
what about the diet aspect of staying physically fit? Dieting can be very hard
There are many different kinds of diets you can choose.  Some include low calorie, low fat, low carbohydrate.