Hey Wilco - welcome to the new community

My favorite cross training activity would have to be cycling. I also look forward to my weekly soccer games, although it's a little harder on the knees on the FieldTurf.

If you can, maybe mix in some sprints on the sand. My softball coach used to take us to Loyola beach at the end of practice in the fall and just drill us. It definitely gives your workout a little something extra.

I hit the gym and hop on the bikes and then lift weights. Other than that, I swim in our pool, just starting laps this week.

What is your primary form of exercise?  I'm a runner and I supplement that with elliptical training on a regular basis and swimming when I get the rare opportunity.  I also have a regular strength training routine of push-ups, pull-ups, and crunches to maintain muscle mass.  Other activities such as biking, team sports (soccer, basketball, etc.), rock climbing, kayaking, etc. are also great.  Find something that you enjoy and supports your main goal areas.

For me, it depends what I'm training for.  If it's for a 10k race, than obviously I'll do different types of running workouts, but I also like to incorporate my martial arts training, such as training.  Granted, I've been doing Karate for quite awhile, but it tends to keep me very loose and flexible, which is great. 

However, at one time I trained for Karate tournaments, so I did a lot other activities, such as running, sprints, weights, basketball, etc. 

So for me, it really depends what I'm looking to train for.

Javier