From my research, heavy isometric training is regarded the best for developing the tendons/increasing stiffness. It’s also the fastest way to CNS drainage too (30-60sec holds).
Muscle can’t compete with tendon elasticity.
And not a spiral in sight. 
From my research, heavy isometric training is regarded the best for developing the tendons/increasing stiffness. It’s also the fastest way to CNS drainage too (30-60sec holds).
Muscle can’t compete with tendon elasticity.
And not a spiral in sight.