010709- Swim

Wednesday morning I hit the pool before work for a 45 minute swim.  I felt pretty good and started with a 300 yd warm up.  I then did 10 x 100 on 1:30s and 30 seconds rest.  I did another 300 at moderate pace, a fast 200 and cooled down with a slow 200.  I tried to focus on keeping my HR up in the 155 range and did so during the 100s.  However, I have a hard time keeping a high HR when doing longer sets like a 300.