How much exercise should a pomeranian get?

I have two pomeranians A male and a female. I walk the male for 4 miles because he is a little hefty and he seems to have more endurance. I walk the female 2 1/2 miles sometimes she can hold out the whole 4 miles but she is a healthy weight and she seems to get tired pretty early in the game. So what should a pomeranian get?
She just turned a year old on March 25th (last thursday) they go in in two weeks for their yearly exam. My male seems to be having dsome problems with his eye so I am going to have him do a completly sweep through of his whole body x-rays and everything. Should I do the same for Dixie? I will definatly talk to my vet about it I never thought it could be joints since she is still so young. She doesn;t seem to be in pain...Just tired.
They get plenty of play time with me and eachother alot of which is outside I set aside an hour a day for each of them to go outside and play just one on one me and that one while the other one is inside so we can continue our personal bond with eachother.
 
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