I got this tempo drill from herb’s old training diary:
1: 100+100+100/100metre walk (50m walk between sets)
2: 100+200+100+100/ 100 walk
3: 100+100+200+200/ 100 walk
4: 100+200+100+100/ 100 walk
5: 100+100+100
Exactly how should they be performed? does the plus sign relate to the 50m walks between ‘sets’ which is supposed to say reps?