Depending on when your competitive season is or when your "big event" is, you need to alter your plan so it augments your endurance and skill training, while getting you ready for competition.
I don't really strength train (because I never have and don't really know much about it) and feel like my lack of upper body strength is the reason why I'm not getting faster.
Michael Silva is the president of FOUNDATIONperformance, LLC, a sports medicine and fitness consultation company. Michael works a great deal with runners and triathletes from the RI and MA area. Michael is a physical therapist, exercise physiologist, and certified strength and conditioning specialist.
Periodized Strength Training Program