I don't know about barefooting but I can tell you that this winter and early spring's routine got me more prepared for slalom this year than anything ever (and I'm not getting any younger). On MWF I do kettlebells of which you can find lots of videos on youtube. I also throw in a lot of abs and obliques (tons of bridges) as well as push-ups.
On Tuesday and Thursday I put a safety harness on and pull two tires (one with a rim) through the grass or snow. Sometimes I do a run/walk/run/walk...... Sometimes just brisk walk with no stopping. I might throw in a tire toss, drag to the tire, toss, drag...and so on. Remember the one Rocky movie??