Back to back swimming

As you know, swimming is probably my worst discipline in triathlon although I have worked hard at it for 5 years.  In fairness my first effort was 40 metres before I needed rescued by a life guard and since then I have completed two Ironman competitions (2.4 mile swim). However as soon as you stop regular swimming you go backwards, rapidly. So last night I attended the weekly coached swim session which was tough, although I felt good.
This morning at 7am I entered the pool for a back to back swim session. After a 300m warm up we did 10 x 100m timed laps - it gets tougher as it goes on. This was followed by 2x 200m and then a warm down. Other than the strain on the 100's which builds your speed, I felt great. So I think I am now getting to grips with my swimming. Just as well as in September I have a 10km river swim! Tomorrow morning I will go out for a run, 1:1 yoga session on Friday and running Saturday and Sunday. For the more observant of you, you will notice a lack of cycling.  This will start seriously by February. I will use it as recovery for my legs from the running and build it up as in June I have a 70.3 ironman. Isn't it good to have a plan!