I have been using a treadmill for the last 18 days - and I have been quite happy with my achievemants on it. Shorter fastish Tempo runs and long constant HR runs for a longer time. But today the seas have been calm so I decided to to an "outside"run around the Promenade deck. - 3 laps equals one mile . I did 7 laps only and piked out. Outside running is definitely harder than treadmill running!!
I HAVE A 10K race in 3 weeks - I badly need to get up to speed!