Were yesterdecades professional sports players more stronger and durable than the ones today?

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I have never heard of so much frequent injuries in the NFL until recent years - for example. The youngsters today appear to be very fragile, despite intensive and ongoing professional training. They are even protected by all manner of new rules, gear and advance technology - and still appear to be injury-prone on a mass scale. I don’t think that much NBA stars and players today -could compete with the rough crew of the ‘70s and ‘80s, for instance - even under the new rule books. Is it just me, or others are wondering the same thing?