Stew Smith (http://www.stewsmithfitness.com and Jeff Nichols (http://www.performancefirstus.com) discuss how and why you need to adjust your training when adding new activities (or old activities you have been unable to do - gym closed etc).
Build up smartly, avoid failing, learn the stop signs to avoid failing but still successfully fatigue yourself to better and faster gains.
Check out other videos of combat swimmer stroke, workouts, and other spec ops related training. See http://www.stewsmithfitness.com for more information about military, law enforcement, special ops, fire fighting training programs.