Swimmers from the Chinese mainland and Taiwan have started the second leg of a swimming relay across the Taiwan Strait.
The event could set a new record in long distance ocean swimming if it's successful.
This challenging attempt will be affected by many factors, such as weather, their physical condition and preparation.
Zhang jian, a professor from Beijing Sport University, talks about the importance of energy during this relay.
"Energy drinks will be supplied every two hours in the beginning, increased to every hour towards the end. maybe even every half-hour. From scientific research, we know how swimmers can suffer exhaustion becaus
