Cal on the treadmill means calories.
Calorie is an energy unit. We often associate calories with food, but in fact they apply to anything containing energy. For example, 4 liters of gasoline contains about 310 million calories. Simply put, 1 calorie of energy or heat can raise the temperature of 1 gram of water at one atmospheric pressure by 1 ° C, and 1 calorie is about 4.186 joules.
Caloric unit calorie, referred to as card. Kcal = kcal; 1 kcal = 1000 kcal; 1 kJ = 1000 joules; 1 kcal = 1 kcal = 1000 kcal; 1 kcal = 1 kcal (kcal) = 4.1868 kJ; 1 cal = 4.184 joules. （calShiShenMeYiSaiPaoBuJi）