- March 14, 2013
- Comments: 6 Comments
- Posted by: Postmaster
I had a few people asking me for some strategies before 13.1, so I said I would try to do a blog for 13.2. Just remember your asking a guy who got stuck at the 135lbs snatch!
In my opinion box jumps are the most important exercise in 13.2. After doing a few calculations box jumps make up just over 50% of the total workout time for most athletes. After watching the videos of Julie Foucher, Lindsey Valenzuela and Annie Thorisdottir it becomes more apparent that this movement is critical.
I calculated the total time of each athlete performing 9 rounds of box jumps. I calculated 9 sets because that’s how many Julie completed in comparison to Annie’s 12 sets and 11 sets for Lindsay. Based on my observations Julie probably would have performed much better if she was competing against another athlete. Her final set of box jumps were her fastest at 33.13 seconds, whereas Annie and Lindsay fastest set was right off the start (21.0 & 23.16). I know some of you will say Julie Foucher has a lower limb injury – it simply magnifies the importance of the box jump.
Here are a few interesting observations:
Overall Time for 9 Sets of
Annie – 3 minutes 47 seconds
Lindsay – 4 minutes 4 seconds
Julie – 5 minutes 20 seconds
Fastest 15 reps were completed in:
Annie – 21.0 seconds (round #1)
Lindsay – 23.16 seconds (round #1)
Julie – 33.13 seconds (round #9)
Why did Annie dominate 13.2? Well if I were to strictly analyze the box jump and the biomechanics of the movement I would argue that Annie had much better mobility in her ankles, which translates to benefits on take off and landing. I took a quick look at the degrees of ankle flexion between the three athletes. This is by no way entirely accurate as it was quite the process to analyze it on a slow motion camera! As you can probably already guess Annie had the best motion.
Most importantly, limited ankle mobility (restricted dorsiflexion) forces early heel raise when jumping on to the box. Raising your heels early will increase the load on quadriceps, calves and plantar foot. This then decreases force coming from glutes and hamstring, which should be the prime movers in this exercise.
Full Ankle Mobility = Full Force from Glutes and Hamstrings
I realize there are factors affecting the biomechanics of the box jump, but I think factors such as rhythm, arm drive and control of body in flight can probably be positively related to improved ankle mobility.
I should also note one factor not related to the mechanics of the movement that is important is the positioning of the equipment (bar & box).
My suggestions to any athlete competing in 13.2: If you think you have restricted ankle mobility perform a soleus stretch and compare it to your teammates. If this motion is restricted do foam rolling, stretching and mobility work in the days before you compete.
Every year you hear about an athlete rupturing their achilles tendon.
I would avoid foam rolling and stretching in your pre-event warm up to the lower leg. I do a lot of work with sprinters and this is one area of the body that I never perform soft tissue work immediately before an event. This tendon needs to remain stiff. Here is a nice research study from a good friend discussing tendon stiffness.
My recommendations in your pre-event warm-up is to include activation exercises. 1) Glute activation exercises will help prevent the movement from becoming quadricep dominant. 2) Eccentric Heel Drops will help prepare the lower leg for when it makes contact will the ground eccentrically.