50 yard backstroke in 23.10 at the end of practice

We had an unexpected hard practice on Tuesday evening.  The practice began with an ab session and should have moved on to a short speed pool workout.  We were surprised with a long 2 hour workout which included 40 x 25y swims at race pace.  Each of the two rounds were capped off with a 50y swim from a dive timed.  My first 50 was a 23.3.  I knew I could swim faster.  The second round was even better with a 23.10!  Probably my fastest time ever in practice, and happend after 5,000 yards.  Not too shabby for me.