Combine your fitness goals. If you want to lose fat, don't burn energy before swimming. After swimming, you can eat some low-calorie food, beef jerky is not ideal, and carbohydrate is the best. Choose a lighter dumbbell and do it according to the number of groups until the muscles in each group are sore.

In order to maintain physical strength, eating beef jerky before swimming is not effective, and the efficiency of converting protein into energy is relatively low. If you must consume energy to maintain your physical strength, it should be sugar.