C25K on my elliptical

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Hello. My name is Kamille and I am 51 years old. I started again with MFP a few weeks ago and it's going fine now. Now I'm started to build up my condotion. I downloaded the app C25K and I'm doing this program on my elliptical. I don't like to run outside and the elliptical is better for my knees. Are the people here who are doing that also on the elliptical and what are you're thoughts about it? How are you doing it? Love to hear your reactions.