Use kick plate
Floating boards, paddles, flippers, lifebuoys and other water toys not only help to burn more calories, but also exercise the muscles of limbs.
Fast short-distance travel
Many people swim very slowly and consume far less calories than fast short-distance swimming, but don't run through fast swimming, or your physical strength will be too fast. You can swim slowly first, then quickly, then slowly, then quickly.
Time-divided practice
Like the training of professional swimmers, swimming is divided into four sections, with breaks 15-30 seconds. The specific arrangement is to swim 1 round trip, then swim 2 round trips, then swim 2 round trips, and finally swim 1 round trip, and each section ends with a quick swim.
Go all out when swimming.
Keep the heart rate at about 80% of the maximum heart rate. In order to ensure this standard, count how many times the pulse jumps within 6 seconds of each swimming cycle, and the next "0" is the heart rate of 1 minute.