Step 1: "Lower Back Pain Excercises" has12100 searches avg last month and (intitle & "") competition:1030; more than 5 Adword ads and Spyfu between $0.50 to $1.47.
Step 2: I went to Yahoo for a longer tail and found "Chronic Lower Back Pain Excercises"
Step 3: Repeat Step 1(with longer tail KW) and this time the search amount is lower and the rest is "Not enough data".
Paradox: the longer the KW, the lower search and competition amounts!
(Why do we look for longer tails KW ,then?)