Very neat -- I was playing with the non-weight stuff in the /guide/ section, and putting it into the playground to get a better sense of it, and noticed this slight parser bug:

I pasted this example into the playground:

  Warmup drills: 3s

  60m sprints: 7.12 7.03 7.01
    # Unit: seconds

  Jog: 1600
    # Unit: meters

And it outputted that I had an activity called "m sprints". Looks like somehow the "60" is getting dropped.