This was a great one.
Pool running: 5 mins warmup, then 8 x (1 min hard, 1 min easy, 2 min hard, 1 min easy). Every 'interval' was 5 mins long, so the time flew by! Finished with 10 x 30 seconds hard, 30 easy.
The reason I have been doing the 30 second sprints, is its GREAT for my core. Longer intervals are harder to sustain for that, but short ones are great for engaging the core; double wammy!
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