Last year was my first foray into Ultra Running and I completed two 50km trail races. Although they were huge amounts of fun, they are very demanding and take a long time to recover from. As a result I have not scheduled any Ultra's until the Fall for this year leaving me to concentrate on triathlon races. Hopefully I will be able to schedule the JFK 50miler in late November.
I found last year that not only do Ultra's take a while to recover from, they also detracted from my triathlon racing. The training for Ultra's meant that I was doing more long distance slow runs and also cycling less. I was running strong but not with the pace needed for triathlon.
Without the Ultra training during this spring I was able to keep the cycling hours and concentrate more on tempo running which produced a fast marathon and PR's in the triathlon races so far. However, with the weather getting better and the nights longer I will gradually get back out onto the trails to make a change from the pavement....and besides running on trails is so much more peaceful and fun!