Represents an attempt within a set, specifying the weight used and the repetitions completed.
Represents a record of a single exercise session, including the date, exercise name,
target repetition range, and the sets completed.
Represents a single set performed within an exercise session, which may contain
multiple attempts if the weight or reps were modified mid-set.
Represents the target repetition range for an exercise, specifying the number of sets
and the min-max range of repetitions for each set.