Hip Flexers, down for the count

I joined a fellow CW swimmer at Fuller to get a jump on training.  I was pleasantly surprised he had modified the coach written workout to be entirely kick!  I knew a 3000+ meter kick workout was overdoing it considering it was my first day back in the water.  We hit the legs from all angles from freestyle kick, butterfly, underwaters, sprints and endurance kicking.  I could feel my hip flexers start to burn by the time I hit 1000 meters.  A day later I'm certainly hurting however I'm excited to build up my legs even before the team starts training again!