My understanding is that with the recent new IO sets, those can only go into actual travel powers, with things like Sprint being restricted to the new "Leaping & Sprints" or "Running & Sprints" category that the original 4 running/jumping sets got moved to.
Looking at the power in the Enhancements screen, I do see Sprint as accepting the "Running & Sprints" category, and looking at the IO itself, it is tagged in that category, but when I try to slot it, Sprint/prestige slide get greyed out.