A Physical Training (PT) data base that was developed by a good friend, and former Navy Seal trainer, will come on-line and feature the fitness regimes that he used. Good core work focus and lots of functional and straight forward resistance training.
Some texts and articles that have provided solid knowledge over the years.
This workout can be done in 35 - 45 minutes. A good first workout, or on a light single workout day. During the warm-up I increase intensity on the last 25 meters of each stroke. Swim all out on the 25x12 section. Then keep an even pace on the 300s. The workout simulates a race with a hard start from the gun and then lengthening your stroke and minimizing your lower body work to keep it in reserve.
This workout is a straight forward, easy to understand workout that can be done in 35 - 45 minutes. A good first workout, possibly followed by a strength workout focused on legs later in the day. The third drill was taought to me by my swim coach, Fred Bartlett. After 7 years of coached swimming, this drill taught me a lot about the correct position for the pull through on the stroke. It is done by entering the hand and slowly bringing the stroke about half way (to the shoulder) and pausing for 3 count before exploding through the 2nd half of the stroke. Focus on high elbow.