It takes between 48-72 hours for your muscles to recover and rebuild after a strength training session, so either approach would be OK.
Personally, I tend to the view that your Tue, Thur, Sat approach would give you 2 48 hour breaks AND a 72 hour break, which mixes the benefits of more frequent ST sessions, with a longer break to allow your muscles to recover more fully.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
"Is it better to have set days (Tuesday, Thursday, Saturday) or just do every other day when lifting weights?" Which schedule are YOU more likely to stick with?
"We cannot change the cards we are dealt, just how we play the hand." ~ Randy Pausch
"There's a difference between interest and commitment. When you're interested in doing something, you do it only when circumstance permit. When you're committed to something, you accept no excuses, only results." ~ Art Turock
"We have a saying in Tibet: If a problem can be solved, there is no use worrying about it. If it can't be solved, worrying will do no good." ~ 7 Years in T
Its entirely up to you, your schedule, and your preferences! Some people thrive on rigid schedules... others are content to take it as it comes....
The one thing to remember is that you should consider getting in one or two rest days a week.... If you are doing something every other day (I'm assuming cardio on the alternate days...), then when are you getting that rest/recuperation?
Personally, I tend to do the "take it as it comes". This is because we *really* enjoy outdoor cardio --walking/biking-- and weather plays a big factor. On the cold, wet days I turn to strength training. So I'm a bit inconsistent...but working on it.... If I end up with two or three days of "indoor" then I make one a day off, or do a really light workout. All the best, patti
Patti "The only thing we have to decide is what to do with the time that is given to us." Gandalf: Lord of the Rings