I have the exact same problem, man. That elastic strength is a killer. I was advised by Nick Newman about a few exercises to help this along (this is my workout schedule for elastic strength 3-4 times a week. I’m not sure how often you should do this. I’d talk to Nick for a little more clarity):
1. Weighted Jumps – Vertical jumps with weights in each hand
2. Deep Squats
3. Hopping – Single leg bounds with very low intense bounding/ hopping forward only using ankle/ calf etc (so keeping leg straight)
4. Static drops – Drop off a chair and land stiff on one leg. Chair doesn’t need to be very high.
5. Stiff legged vertical jumps – just vertical jumps but with an emphasis to have very little leg bend when landing
6. Bounds into the sand.
7. Box Jumps – I added this, but it’s basically the same thing as hopping except you jump onto a stable box with one leg and jump back off, then do the other leg.
I’d also do some calf workouts as well. Elastic strength is centered around making the leg stiff, so there is a big focus on the lower part of your leg (calfs, ankles, etc). Correct me if I’m wrong, guys. I’m just learning about this stuff.