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I hope it's pretty simple. What is the best program to both gain some muscle mass/strenght and gain endurance ? Would it better to alternate frequently (every 1-2 days) between cardio training and weight lifting or go for a smaller frequency (1-2 weeks) ? In case this matters, I have a BMI of about 20 that I plan to get to about 23 and I can run a semi-marathon but I'm aiming for a Half-Ironman.

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BMI is not the best measurement to track your progress. To determine body composition, consider tracking your body fat percentage. –  BackInShapeBuddy Mar 25 '13 at 10:31
    
Maybe your goals are a bit conflicting. Increasing your BMI from 20 to 23 is challenging. For example, if your height is 180 cm, the a BMI of 20 means that your current weight is about 65 kg. In order to increase the BMI, your new weight will have to be about 75 kg. Gaining that much in muscle while training/competing in endurance sports sounds difficult. –  FredrikD Mar 25 '13 at 15:21
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2 Answers 2

One way to achieve added muscle like this is to gradually add heavier weights to your endurance training. For example, instead of just running you could run while pulling weights or a weighted sled. You can also use hills to add difficulty by letting gravity give the feeling of added weight.

That being said, if you're running long distance races you may not want to do too much bulking up. I'm personally a big fan of circuit training because you get the combined cardio and strength training. If you limit yourself to your own body weight or to moderately heavy weights, then you'll still gain lean muscle.

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Most important principle in programming is the SAID principle: Specific Adaptations To Imposed Demands.

That means your body will respond to the demands you put on it. Please review this article called "Death By Prowler", in particular the section on energy systems. The big take away is that marathon running and weightlifting require opposing adaptations. As such, your body will do the best it can to compromise with the stresses you are imposing.

Best Case: Alternate Emphasis

If you have the time to plan out your training, you will give more emphasis to the activity you need most at the time. If you are preparing for a race, the natural emphasis is going to be on your running program. If you are preparing for a lifting competition, the natural emphasis will be on your strength training.

  • Whatever has emphasis: do it at least 3x a week, or whatever your program requires (such as every other day).
  • Whatever is de-emphasized: do it at least 2x a week with a goal of at least maintaining strength or conditioning.
  • Use "advanced" strength training programs that allow more time for recovery before increasing intensity
  • Use well written/tested running programs for preparing for your race

In the running off season, you can maintain a decent level of conditioning by running an easy 5k twice a week. The effort should be in the aerobic zone, and it's purpose is just maintenance. This is where you'll spend more time strength training.

In the running season, you'll lift 2x a week using a program like Wendler 5/3/1 (there's different variations) and not worry too much about increasing weight. Perhaps work on increasing reps--which also helps with muscular endurance.

Worst Case: Training Both Simultaneously

A friend of mine agreed to do a power lifting competition with me, and then a few weeks later told me he entered the Marine Corp Marathon. The race date and competition dates are only a couple weeks apart. This is going to be a rough time of training, particularly because the legs are getting fatigued from the running and the lifting.

  • The most important thing is fatigue management. It's better to lift and run on the same day and have a day off than it is to alternate.
  • Use a 2x per week program for strength training
  • Never go to failure on either lifting or running. That can throw a wrench in both programs.
  • Only really possible when you are a beginner lifter.

I'm still feeling out the specifics on this. Since I'm acting as my friend's strength coach, I'm going to have to monitor and adapt his programming. Currently, his squats are having problems, and a good reason for that can be the fatigue from running. I'm going to have to tweak the strength programming a bit to help him realize his goals.

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