I’ve read about the indirect mechanisms etc. But I had always thought that for a 100/200m sprinter, those would be done in addition to shorter MaxV and Speed Endurance work. Since the OP was talking about doing only two days of running, is it being suggested he would be better off with intensive tempo instead of Max V and Speed Endurance and worry about MaxV work later? If so, why is intensive tempo better, in this particular situation, for developing 100/200m speed than traditional MaxV and SE?