The Strength program works on the muscles that are necessary for a Bharatanatyam dancer. The requirement primarily lies in the Quadriceps and Gluteals, but it is necessary to balance the strength in other muscles so the joint is stable and efficient in movement. Each module will work on a combination of muscles and address functionality of movement. Please start slowly with the instructed Strength regimen first and then move onto the ones with music. It might seem tedious at first, but this will ensure your slow and systematic progress. Do not do anything that feels excessively uncomfortable. Muscle work and "bad pain" are two separate things. Please make sure you have rested and eaten properly (1 hour prior) before doing a strength regimen.
Although we call it "strength" , it works more on functional efficiency than just the exact weighted power of a muscle. Functional efficiency has a direct effect on you stamina and power in dance. So the Raadha Kalpa method includes more of this in the training system.