timing how long it takes for your kettle to boil 1 cup (250ml) of water. looking at the power of your kettle (Watts, often found on the base of the kettle) joules = wattage x time (in seconds)
Rock climbing can help build and tone your legs and glutes. Indoor rock climbing is a sport that when properly executed, recruits every major muscle group in the body. Rock climbing is a full body workout that tones and strengthens the arms, shoulders and core muscles. You can also effectively strengthen and tone your legs and buttocks with regular indoor rock climbing sessions.
There's nothing like a workout for climbing than by climbing. Gym climbing lets you work the specific muscles used for specific moves, and gain muscle memory at the same time. However you can't always make it to the gym. These rock climbing exercises should be used in a robust scheduled rock climbing workout.