When it comes to training for marathons and the like, it’s all about genetics, says Mike Rizzo, who has spent nearly a decade on the recreational trail.

When it comes right down to it, training hard on the trail is a genetic trait.

Rizzo has been a trail runner for more than 20 years and says a key factor in a good race is your genetics.

“If you’re running the same race twice, your genetics are going to play a role,” he said.

You have to be strong, you have to have a high aerobic capacity and your aerobic system has to be in good shape.

So genetics plays a role in your ability to run the marathon.

Rizza and his co-authors also say genetics is a big factor in the ability to stay hydrated.

And genetics plays into how long you can run on a given day.

You’re going to have more success with shorter training days if you’re genetically stronger.

Training hard on a trail also plays a big role in the amount of time you spend on the trails.

You want to run for as long as possible, so the longer you can do it, the better.

The more training you do, the longer it will take you to recover from the training.

In general, a good way to train for marathon training is to have some time in the early morning and late afternoon before a race, said Jeff Volek, a professor of sports medicine at the University of Texas at Austin.

For marathon training, that means working on running and other aerobic training for 10-15 minutes at least twice a day.

Volek said it’s not necessarily necessary to do all of your training before a marathon.

In fact, the optimal training time is a few minutes before and after a race.

If you don’t want to train before a big race, Voleck said, that’s fine.

A great way to start a big training week is to do a few races, said Voleks co-author Chris Evert, a running coach who is also a certified personal trainer.

First, he suggests you do some short-distance races, like 5Ks or 5K-10Ks, that last for a couple of hours.

Then you can go back to short-term training, Voles workbook says.

Then, go for a long run, Vokes suggested.

Once you’re in shape, Voss said, you should go for long runs and run the entire distance in about three hours, which is a pretty good recovery time. 

But if you plan on racing for a marathon, you’ll want to get your training done in the first three weeks of the race, and then move on to longer-term workouts.