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by switchbak 22 days ago
You need to ramp up, of course. Given you're training at an appropriate rate, and you're doing sensible things - you should be fine. By sensible things I mean: short and intense weight training, intense cardio sessions, and not-too-long endurance sessions (eg: < 5h). More endurance is fine, but it can be very fatiguing, especially for the older athlete. If you ramp up to those over time, you needn't worry about "free radicals" (that's an oversimplification).

Recent research highlights a number of things, but what sticks out is that it's important to maintaining muscle mass because we lose a bunch as we get older, and loss of muscle is a leading morbidity factor.