When a swimmer drafts behind another swimmer, the hydrodynamic conditions are identical in effects to those afforded by aerodynamics. Drafting produced a 5% reduction in energy cost which translated into a 6% increase in swimming speed. Physiological measures and perceived exertion reflected the lower energy cost while drafting. Distance per stroke and stroking frequency were increased. This could be a problem during training when swimmers use circle patterns in the same lane. Specific training objectives could be compromised because of easier work when drafting is allowed. Implications: Several actions need to be taken when drafting is a problem during training. 1.Prescribed paces should be at least 5% faster. 2.Shorter work:recovery ratios can be used to increase the energy demands to compensate for the reduced loads of drafting. 3.Provide the largest distance between each swimmer to avoid the drafting condition.