Not so bad thanks, I’m going back a few years now, I had a crop of well conditioned athlete’s and wanted to take them up a level. We used car tyres, 5kg for the guys and 3-4 kg for the females. I worked on volumes recommended by a GDR Coach who reckoned that no more than 300m total volume of resisted running should be used in one session. So we went up to 10x30m 5x60m 3x100m and 2x150m. I had a theory regarding heightened neuromuscular excitation caused by resistance running and experimented with this and sure enough it seemed to work. I think you have to be in good shape to make this work, we certainly had some good results around that time.