David Starbuck Smith joins us for the 65th episode of Baseline Intelligence. David wrote the popular book "Ageless Painless Tennis" and specializes in overall health and performance. We talk: 1:31 Getting older doesn't mean getting weaker 5:32 How active is active enough? 9:45 Developing good posture 12:45 What is core strength? 17:48 Elbow pain 20:40 Clay vs hard court for injury prevention 22:55 Where to look for increased performance 27:27 How long should you warmup for? 28:42 Secret to maintaining your level as you get older 29:32 How sleep impacts your health 30:55 Best advice for the 4.0 player David's book link https://www.amazon.com/Ageless-Painless-Tennis-Limitations-Potential-ebook/dp/B081TNQF1T David's website https://davidstarbucksmith.com/