36-Week Half Distance Triathlon Training Plan for Senior Triathletes 60+ Train Smart. Stay Strong. Finish Proud in Westfriesland. Are you a triathlete over 60 ready to take on the Half Distance Triathlon Westfriesland? This 36-week, science-based training plan is specifically designed for experienced seniors who want to stay competitive, maintain strength, and race with purpose—without the risk of overtraining. Whether you're returning after a break or starting from scratch, you'll build the ...