If you're consistently working out, you're probably anxious to see some muscle definition. But be patient, muscle growth can take weeks to months to occur.
The Timeline for Building Muscle
How Long Does Muscle Toning Take?
When Do Muscles Grow After Working Out With Weights?
Workouts livestrong
Rowing Machine: How Long Does It Take to See Results?
When Do Muscles Grow After Working Out With Weights?
Kim Nunley livestrong
How Long Does Muscle Toning Take?
Rowing Machine: How Long Does It Take to See Results?
Central Nervous System & Lifting Weights