Agility is a skill that is very important in the game of basketball as basketball is not a straight game. It requires multitasking like looking where the opponents while bouncing the ball and move towards the basketball hoop with speed and quickly change the directions.
Agility helps in activities that require maintaining balance, strength, speed, and body control and able to quickly change in directions. It is an essential skill in many sports that translate into faster response and better performance.
Are the bumps kinda hard and squishy? If so they could possibly be either fat deposits or tumors. Its always best to get an expert approval so I recommend taking the dog to the vet just to be on the safe side.