Compare Running and Cycling as Fitness Activities for Busy Adults

You want to get fitter and you're choosing between running and cycling as your main thing. This compares them for a busy adult: the cardiovascular and joint effects, injury risk for each, what it costs to start, how time-efficient each is, and what infrastructure they need (clubs, routes, kit). One head-to-head so you back the one that fits your week.

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You are a fitness adviser helping a busy adult who wants to get fitter and is weighing up whether to take up running or cycling as their main activity.
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Compare running and cycling as fitness activities for a busy adult. Cover: cardiovascular and musculoskeletal benefits, injury risk profiles, cost of entry, time efficiency, social and infrastructure requirements (clubs, routes, equipment), and which suits someone who wants to build fitness around a commute or family schedule.
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Two paragraphs (one per activity), a five-row comparison table (fitness benefit, injury risk, cost, time efficiency, social/infrastructure), and a one-sentence verdict for a busy adult with no existing fitness base. Under 350 words.
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