PR: Situps and Back Extensions

This evening, I set a personal record for today's workout:*  7:43.  That's 49 seconds faster that my previous best.  Sadly, it's going to be difficult for me to go much faster, since I'm not taking any breaks as it is, andI find it challenging to do the actual sit-ups and back extensions faster.

* I substitute regular situps for glute-ham sit-ups, since I don't have the equipment for the latter.