I do body weight exercises and I don't lift heavy. What kind of results are you looking for? I personally think being able to move your body in space is really beneficial. I like the improved balance. I like the toned muscles. I like that I feel strong for other exercises without having to spend a lot of time doing those other exercises (can't go for long hikes or bike rides every day, you know.) I find body weight exercises to be very hard and I get sore every damn time I do them so I assume they must be doing something every single time.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.