How to fix patellar tendonitis. Key takeaway: the spanish squat isometric performed 5 sets of 45 second holds often decreases patellar tendon pain in the short term while you slowly rebuild your tendon capacity with HEAVY slow tempo strength exercises. If this does not change your pain at all or makes it worst - you likely dont have tendinopathy & have a different kind of knee pain. #kneepain #basketball #volleyball #legday #gym #fitness #jumpersknee #jumping