. >> reporter: ivanov treasures his mementos from his sumo wrestler days.is memories inspire him to take on this new challenge in japan. >> reporter: the owner of the gym where ivanov holds the online classes supports ivanov's second life. >> translator: i'm impressed with his seriousness and earnestness. i want to help him as much as i can. >> reporter: ivanov knows sumo helped him grow and achieve success in japan. now he thinks it is time to return what he owes to this country by teaching and sharing his deep knowledge of the sport. morita hiroshi, nhk world. >>> tsunami health ♪ >>> let's check out the world weather with our meteorologist tsietsi monare. so people in northern asia are enduring bitterly cold temperatures today. what do you want to tell them to watch out for? >> people certainly need to watch out. overnight temperatures can drop so quickly and that can cause a lot of damage to your plants outside, maybe even your pets. you might forget them and might forget to put in an extra blanket indoors. temperatures can drop so suddenly and is happe