Well, did a 25 miler in 2.5 days. By the end my 30 pound pack felt like 300! I finally figured it out. If I started doing squats with 30 pounds for 2.5 days straight it would be like hiking the Canyon!
Phantam Ranch on the South Kaibab, then out to Sumner Butte, then up the Bright Angel through Indian Gardens. There is just so damend much out there it is hard to pick a place to go!