Kathleen Trotter has been a personal trainer and Pilates equipment specialist for 10 years. Her website is www.kathleentrotter.com.

The question: I am thinking of signing up for a Tough Mudder this summer. What can I do at the gym to prepare myself?

The answer: Good for you! I have heard great things about Tough Mudders. Doing one is on my fitness bucket list.

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What I love is that the race requires a unique combination of cardiovascular endurance, agility and strength.

Twice per week, do a workout in which you alternate intervals on the treadmill with strength and agility exercises. This type of training will prepare you to seamlessly alternate between the race's strength and cardiovascular challenges. Here's a sample workout:

If you don't belong to a gym, skip rope or run outside instead of using the treadmill, and do strength exercises like squats in your living room. Once it is warmer out, alternate running outside with exercises like step-ups and dips on a park bench.

Trainer's tip: I am a big fan of spending one workout per week focusing on your weaknesses. If you have weak shoulders, strengthen your rotators and other postural muscles. Weak ankles? Dedicate a day to lower-limb stretching and strengthening. You are only as strong as your weakest link. The main takeaway: Train smart. Progress gradually. Don't get caught up in the excitement of the race. If you don't currently run, start by jogging or walking. Take adequate recover days, eat well, sleep, stay hydrated and stretch.