Dog Exercises?

i have 2 dogs both shih tzu crosses,
they do not like going on walks.
i have become worried that they may be becoming un-fit, and would like to know is there any other things as in excersises i could o with them in my back yard, i don't have money as im a child but would really love my dog to get good excersise and have fun with me in the mean time,

yours sincerly,

nikki x

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