How important is speedwork when training for a 10 mile open water swim? I am relatively new to marathon swimming and I am training for Swim The Suck in October. Should I focus mainly on endurance and form (which i love!) or also add in some speedwork ( which i hate)? I currently swim 4 days per week averaging 12-13,000y per week, and will add a 5th when pool reopens after maintenance.. I also use a VASA trainer to work on form/strength and stroke rate (and to use when pool is closed). Also, are there any training plans out there to use as a template?