THE NUMBERS DON'T LIE: WHY RUNNING PERFORMANCE CAN PREDICT YOUR BCS SUCCESS
By NSW Assessment Team
Posted May 13, 2016
Running performance is the best predictor of Basic Crewman Selection (BCS) success, but there is more to success than simply running a certain distance in a specific time (such as a competitive 1.5-mile time for the Physical Screening Test (PST), or being able to meet the 4-mile run standards throughout the phases of BCS. It's important to be able to recover quickly and completely between several high-intensity evolutions during the week. Those who are faster on timed runs tend to have a more developed capacity to recover.
Over the course of three years the Naval Special Warfare's (NSW) Director of Fitness studied Basic Crewman Selection classes 78 - 89 (299 SWCC candidates) to find out if successful SWCC candidates, who complete BCS, show different physical abilities than SWCC candidates who drop from training.
The study was comprised of the Naval Special Warfare Human Performance Assessment ("SWCC PRT") and the Naval Special Warfare Preparatory (NSW Prep) School Exit Test. The "SWCC PRT" was comprised of a total of 277 SWCC candidates and the NSW Prep was comprised of a total of 299 SWCC candidates.
The NSW study found that running is the biggest predictor of BCS success. Running as a predictor of BCS success was greater than for any other fitness variable measured (including: swimming, calisthenics such as push-ups, sit-ups, and pull- ups, and measures of strength including bench press and dead lift).
Research from various military selection/training programs shows that performance on timed runs is also the best predictor of injury (slower runners get injured more frequently during the program). In the athletic arena, for sports like soccer, there is a correlation between aerobic fitness and injury. It makes sense - when people get fatigued, technique tends to break down and they are more likely to make mistakes that result in injury. People with more endurance are more resistant to fatigue and less likely to make injury-prone technical mistakes, no matter the sport or standardized military training program.
Since there is a competitive element to BCS ("It pays to be a winner"), you have to be faster than the majority of your classmates to have a reasonable chance of succeeding. In some cases, what was fast in one class (77) would be slow in another (87). This is out of your control so don't worry about it. The best strategy in preparing for BCS is to reach the best performance you can without overtraining or causing injury. Yes, that is a tough course to follow and a hard line to balance.
.3-MILE RUN ("SWCC PRT")
- Smart training goal: 21 minutes or less
- Best score for any SWCC candidate who completed BCS: 17:01 minutes
- Worst score for any SWCC candidate who completed BCS: 24:11 minutes
- Best score for any SWCC candidate who dropped from training: 18:14 minutes
- Worst score for any SWCC candidate who dropped from training: 24:42 minutes
Running ability correlates strongly with success in BCS. It has the largest Effect Size. Running quantifies aerobic fitness, which impacts your ability to sustain work output and recover quickly after physically demanding evolutions. As run times get faster, the odds of completing BCS improve, though benefits may plateau at 20 minutes. The risk of being Med Rolled appears to be less for 21 minutes or faster.
The take-home message is to improve your running to the best of your ability, because it is the single most important factor for completing BCS. Use good judgment when training to reduce the risk of getting injured while running.
.3-MILE RUN (NSW PREP EXIT TEST)
- Smart training goal: 21 minutes or less
- Best score for any SWCC candidate who completed BCS: 17:22 minutes
- Worst score for any SWCC candidate who completed BCS: 23:21 minutes
- Best score for any SWCC candidate who dropped from training: 18:31 minutes
- Worst score for any SWCC candidate who dropped from training: 23:50 minutes
In addition to the 3-Mile Run during the “SWCC PRT”, SWCC candidates perform a 3- Mile Run during the NSW Prep Exit Test. Though the format of each assessment is different, the results of both 3-Mile Runs are consistent. Running ability correlates strongly with success in BCS, with the largest Effect Size. Running quantifies aerobic fitness, which impacts your ability to sustain work output and recover quickly after physically demanding evolutions. As run times get faster, the odds of completing BCS improve. Statistically, completing this 3-Mile Run in less than 22 minutes provides the biggest advantage compared to slower runners, with a general trend of faster scores corresponding to greater success. Sub-21 minute runners also appear to be at less risk of being Med Rolled than slower runners.
The take-home message is to improve your running to the best of your ability, because it is the single most important factor for completing Hell Week. Use good judgment when training to reduce the risk of getting injured while running.
.RUNNING AT BCS
Preparation for the SWCC PST and BCS must include a sound running program. Performance on times runs of varying distances (1.5 miles, and 3 miles) correlates well with probability of completing BCS in a fairly linear fashion ( faster means higher probability of completion). Students in BCS must complete 3-mile runs in progressively faster times throughout Basic Crewman Training. BCS students must run dozens of miles per week moving to and from different locations at the BCS compound just to do other training evolutions like swimming or carrying boats or even to get chow at the galley. The running program detailed in the Naval Special Warfare Physical Training Guide (NSW PTG) is designed to develop the endurance and speed to excel on the PST and the necessary abilities to complete BCS. The Naval Special Warfare Preparatory School (NSW Prep) conditioning program which candidates complete following boot camp at Great Lakes, Illinois prior to shipping to Coronado, CA provides the opportunity to further develop running fitness.
Students who begin BCS have demonstrated that they're solid runners. Yet some BCS students struggle, at least initially, with the running evolutions at BCS. How can this happen? Most likely they are affected by the demands of performing in a new environment under novel circumstances. For example, after months of training in running shoes, BCS students run in boots at all times. Despite what you may have read elsewhere, and the apparent logic behind preparing early, the various medical and conditioning experts at the Naval Special Warfare Center recommend that candidates limit training in boots prior to beginning BCS. Wear appropriate running shoes for the majority of training, and restrict running in boots to short, occasional sessions. BCS students wear boots while at Great Lakes except for running and physical fitness (PT), so they get a chance to break them in and condition their feet, and will begin to wear them during running and PT during NSW Orientation. The transition will go smooth for students who arrive with a solid conditioning base and a natural, efficient running style.
A major adjustment to running at BCS is the soft sand that forms the terrain of many conditioning runs and training evolutions. Many students arrive having put in plenty of miles on roads or tracks but never having run on a beach or other yielding surfaces. BCS candidates who have access to beaches or other spongy terrain may take advantage of the opportunity to incorporate these surfaces into their running program. Be aware that running on sand is more stressful than many people would expect. We tend to equate soft with cushion and low impact, but the flip side to the coin is soft sand offers little support and too much give during propulsion. In short, running in sand is quite stressful and (as with all aspects of training), SWCC candidates should add sand running to their overall mileage gradually and progressively, beginning with a modest tolerable amount such as half a mile or less. The percentage of total miles on soft sand should initially be limited to no more than 10-15%. Eventually, as conditioning improves, sand mileage can be increased to a larger percentage of total mileage, but as a general rule of thumb, limited to no more than 50% of total miles, with one third of total miles probably a good proportion. It is important to keep a balance between getting familiar with soft sand and running on firm surfaces to allow appropriate speed development.
Running on sand requires stabilizing work from the lateral muscles of the hip such as the gluteus medius, and the peroneus muscles of the lower leg. When these muscles are weak or become fatigued, performing on unstable surfaces causes misalignment of the lower extremity that may result in pain and injury. BCS candidates should have a proactive strategy for increasing the strength and endurance of these muscles before entering the official NSW training pipeline. There are a wide variety of exercises and activities that can be incorporated into a general conditioning program, as detailed in the NSW PTG.
Examples: Improving running stabilizer muscles
- Do monster walks using an elastic band for resistance
- Do standing hip abduction using a cable machine, elastic bands or rubber tubing
- While lying on one side, perform hip abduction against manual resistance from a partner, or using ankle weights
- Do the calisthenics exercise known as the "dirty dog" or "fire hydrant": begin in a stable position on all fours (hands and knees), and externally rotate one hip out to the side, keeping the hip and knee bent to 90 degrees, until the thigh is parallel to the ground. Perform the desired number of repetitions and switch to the other hip
- Perform side lunges using body weight or while holding dumbbells
- Use a slide board, or do lateral skater's hops back and forth to points a couple feet to either side of your starting position
- Do short sprints that require zigzag or cutting movements, or do carioca maneuvers
- Use equipment that requires balance and stability, such as wobble boards or BOSU balance trainers
- Do in-line skating, ice skating, or cross-country skiing
As with all aspects of fitness, start at a manageable level and be progressive over time. Vary your routines to emphasize both strength and endurance. Be aware of the effects of adding new exercises or routines to your overall program (including running and swimming). Work hard, but also be creative and have fun.