I decided a couple weeks ago to start training for my first triathlon in August -- I'm pretty psyched! I've been swimming since I was very young (although I haven't competed in probably 8 years, and since I quit competition it's been pretty on-and-off), biking all over town since I bought my first adult bike last year, and running at the gym occasionally over the last couple years. BUT, mostly I do sprints. I don't feel like I have much endurance in any of the 3.
I've been training relatively hard over the last two weeks or so, and at this point i'm just tired. I've only been going to the gym maybe 4 days a week, but I've been biking short distances almost every day. I had to promise myself I wouldn't go to the Y today (though I did bike to church...), because I'm just physically exhausted. I've been focusing mostly on endurance, especially with running and swimming, since I feel like that's my biggest weakness at this point. My bike training is kind of on hold, since I'm saving up for a new bike after mine got trashed outside of the school where I work. So I've been tooling around town on my heavy old cruiser (with a basket!), but that's never more than 3 miles at a stretch.
So. Any training tips? Does the tiredness mean I should be taking more days off, or just doing shorter workouts? Both? What other things should I be looking out for?