Speed - rude awakening

Being a retired woman now, I was able to join up with the Boulder Road Runners this morning for their speed workout. What a change of pace (so to speak). Patti (looong-time running buddy), Sally, and I ran together for a set of 10 x 2 minutes hard/1 minute easy. 'Twas a simultaneous sensation of reawakening fast twitch muscles (the few that I have) and squawking hams and glutes (a veritable cacaphony of squawks). I think I may try this again next week!