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While running, cycling and swimming of course require and develop excellent cardiovascular fitness and lung capacity, efficient performance of all three also requires good biomechanics, mobility, and a good strength to weight ratio.
Long and short runs, rides and swims, as well as sprints and intervals performed at different intensity levels will help develop both aerobic and glycolytic fitness across running, swimming and cycling. Meanwhile appropriate mobility and flexibility work will help ensure good mechanics while optimizing performance and reducing recovery time. An additional modest amount of strength training will help keep a strong core for efficient force transmission, while total body strength will help you develop more efficient movement and generate more power per stride, stroke and cycle.