Please try this endurance workout and especially target your shoulders.
This training is extremely helpful for someone who practice boxing (to survive 12 rounds if you are a professional boxer), other martial arts, or if someone just want to increase his/her endurance/stamina.
I found this training on Kostya Tszyu’s KZread page and slightly modified to fit my level of physical ability.
Here is the original link to Kostya Tszyu’s page:
• Проверка на прочность....