I agree with above poster - only you can answer that - which is why it is SO annoying when friends etc. chime in on things they know nothing about.
I walk 3 miles to/from work every day but that's not my cardio workout. My
co-worker rides her bike to/from work 12 miles - that's not her cardio because for both of us, that's not nearly enough. For others, a 12 mile bike ride or 3 mile walk is more than they usually do. Everyone is different.
You have to work it out based on your current activity level. You can also play around with it. Instead of 1.5 hours some days, if you want, try to go as hard/fast as you can for half the amount of time rather than liesurly so you switch it up. Honestly, if you feel good and you're seeing the results you want, I definitely don't think it's too much, esp. if you're also weight lifting.
Last edited by lm3898; 08-01-2012 at 02:14 PM.