Very brief - on rare occasion I'm capable of brief posts!
There's nothing wrong with walking 10,000 steps, it's perfectly good exercise. I remember reading long ago that the best exercise program is swimming (multiple styles) alternated with running or cycling. Swimming gives you multiple muscle group workouts with resistance and is low-impact, but doesn't give you good cardio.
Basically you'd alternate, daily, swim on day 1, cycling day 2, etc.
Cycling is good cardio and low-impact. Running is good cardio, but not low-impact.
Unfortunately I'm a horrible swimmer: dense bones, fairly negatively buoyant. But walking in water at neck height is also good exercise: resistant and low impact, just doesn't work as many muscle groups.
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