Paddleboarding can be a good activity for weight loss, but it depends on various factors such as your current weight, how vigorously you paddle, and how long and often you engage in this activity. Paddleboarding is a low-impact exercise that can help burn calories, improve cardiovascular health, and tone muscles.

The number of calories burned during paddleboarding can vary depending on factors such as the intensity of the workout, the person's weight, and the duration of the activity. According to the American Council on Exercise (ACE), a 125-pound person can burn around 283 calories per hour while paddleboarding, while a 185-pound person can burn up to 444 calories per hour.

The main muscle groups that are being activated during a paddle are your mid back muscles (latissimus Dorsi), Shoulders (deltoids), Arms (triceps & biceps) and abs 

In summary, paddleboarding can be a fun and effective way to burn calories and improve overall health, but it should be combined with a healthy lifestyle for optimal weight loss results.