Rikishi training - 力士
The training of sumo wrestlers (called keiko) is always early in the morning and very intense. It takes place in heya and is based on strength, flexibility and endurance exercises. Rikishi are fasting when they start training.
Training begins at 5 a.m. with warm-ups and endurance exercises. Rikishi raise their body temperature and train their endurance with cardiovascular exercises.
Jogging is excluded because it is too dangerous for the back, knees and ankles because of their mass. When the heya has it available, the rikishi can take a bike ride around the neighborhood to warm up.
Once the body is warm, wrestlers begin a series of fairly long and intense abdominal and lower back exercises. The aim of these exercises is to strengthen the abdominal strap and develop the stomach, to form a strong box.
Then the wrestlers continue with flexibility and strength exercises. These exercises last up to 8 hours.
From 8 a.m. to 11 a.m. the rikishi train for combat by competing against each other until exhaustion. The training ends at 11 am, the rikishi eat and rest.