I know when i was at the AIS in canberra back in 1999, they used Pool work for the Injured. One guy, a 5klm runner, was injured for more than 3x months, unable to run at all (stress fracture). After 1 x month of actually running, he was back to running sub 14min 5k.
Our group got to try it out a few times, You have to really concentrate and work hard to get results. Do it wrong, and it can cause other injuries, do it too easy and it wont do anything for you.
Personally, i would prefer one of them X-trainer machines you get in gyms.
Depends what you got access to hey?
Any idea what the “fancy drills” were?