Titan Fitness 10lb–40lb Adjustable Kettlebell Set
Similar to adjustable dumbbells, this kettlebell adjusts with you from beginner level to advanced workouts later on.
PowerBlock “Sport 24” Adjustable Dumbbells (Set of Two)
The utility of eight dumbbells in the space of one.
Workouts++ for Apple Watch and iPhone
Lets you completely customize your Apple Watch workouts to display whatever fitness data you'd like.