Graduated in early December but after a mare of a run on Sunday, I'm going back through the programme again but doing sprint/jog intervals on the treddy instead of run/walk. So today, I sprinted for a minute, jogged for 90 seconds, and repeated for 20 minutes then ran at my normal pace for 10 minutes so it was still a 30 min work out. Has anyone else done this? It seemed to really work today and made the time go by quicker, but is this feasible to do for much longer? I say sprint, but it's more of a fast run (fast for me anyway) at 11kmph (my normal speed is around 8.5kmph on the treadmill).
I want to do it twice more this week, then next week do the same for week 2, but how far can I push it?
For instance, sprinting for 20 minutes at week 5 wouldn't be an option. Wondered if people recommend a point this will work up until.