Strength training is one of the most effective ways to reduce body fat, increase lean muscle mass and burn calories more efficiently, strength training is an important part of any fitness program. If the fixed dumbbells are too light, you can choose the Lee warehouse 55kg dumbbell set, Simply unscrew the spinlock collar and increase the load slightly by adding another disc. 55kg adjustable set includes 4 x 5 KG Plates 4 x 2.5 KG Plates 6 x 1.25 KG Plates 6 x 0.5 KG Plates 1 x 5 FT Standard Bar 1 x 5 FT curved bar 2 x Dumbbell Rods (32 cm long) 8 x Spin Lock Collars