ADJUSTMENT RANGE:3LBS,16LBS,28LBS,40LBS,52LBS STRENGTHENING PERFORM ALL EXERCISES IN A CONTROLLED MANNER. BE SURE TO SYNCHRONIZE YOUR BREATHING CORRECTLY: BREATHE OUT WHEN TAKING THE STRAIN AND BREATHE IN WHEN RELEASING PRESSURE. IMPROVING STAMINA: CONSIDER PERFORMING AN EXERCISE UP TO 15 TIMES(REPETITIONS) SET AND THEN 3 TO 5 SETS I.E. 10 REPETITIONS 3 SETS WITH A REST BETWEEN EACH SET. IMPROVING MUSCLE MASS:CONSIDER PERFORMING AN EXERCISE AT LEAST 6 TIMES(REPETITIONS) SET AND THEN 3 TO 5 SETS I.E. TAKE A SHORT BREAK OF 1 TO 4 MINUTES BETWEEN EACH SET OF EXERCISES. 3-5 TRAINING SESSIONS A WEEK,WITH A DURATION OF 20-40 MINUTES,IS RECOMMENDED. WARNING THE SAFETY AND PERFORMANCE OF THE EQUIPMENT AND ONLY BE MAINTAINED IF REGULARLY CHECKED FOR DAMAGE AND WEAR. THESE DUMBBELL EXERCISES ARE NOT SUITABLE FOR CHILDREN BELOW 15 YEARS OF AGE. THESE ARE NOT TOYS. PLEASE KEEEP DUMBBELL SET OUT OF THE REACH OF CHILDREN. PLEASE DO NOT LIFT THE WEIGHT ADJUSTING KNOB WHEN THE DUMBBELL OR HANDLE HAS BEEN LIFTED FROM THE DUMBBELL TRAY. PLEASE DO NOT DROP THE DUMBBELL TO THE FLOOR. THE WEITHT OF THE DUMBBELL CAN BE ADJUSTED BY TURNING THE HANDLE.