Week 8 Key Run #1

So I cheated this week and I don't really remember why, other than with this commute it's hard to go running in the daylight. I did my key "run" on the elliptical at the gym:

• 10 minute warm-up
• 5 x (2 min fast/ 2 min easy)
• 10 minute cool-down

Definitely a good cardio work-out, but the muscle movements are just not the same.