Good topic. I lifted weight off/on from 18 to 44 yrs old. Last 5 yrs I started swimming (mild) every day and it is the best decision I've made. When I lifted I became obsessed with getting to the gym after work - I was extremely bummed if I screwed up my workout schedule (because timing is crucial for building strength). If I jogged my mind would race like mad (and navigating curbs and holes made me a mental case). Jogging is kind of a metaphor of life - running and running to reach the next goal or next step in life, etc. (I heard Seinfeld say that and that's how I felt). Swimming is perfect - resistance is perfect and does wonders for all muscle tone and for cardio. I'm 50 and in the best shape ever - I went from 35 to 32 waist within 2-3 mths. I'm 5'10", 165 lbs. After swimming I feel fantastic - relaxed and improved concentration for several hours. I would never run again - it was nerve-racking. And lifting did a number on my joints.