Final answer:
To improve flexibility, contract-relax stretches should be done twice a day, as consistency is crucial for increasing tissue elasticity and range of motion.
Step-by-step explanation:
The contract-relax stretch technique is used to improve flexibility by applying a 3 to 6-second resistive hold at 20-50% of maximum effort with a 10-30 second static hold. To improve flexibility, this stretching routine should be performed twice a day. It's important to incorporate these stretches into daily routines to gradually increase tissue elasticity and range of motion. Consistency in stretching is key, as sporadic stretching may not provide the same benefits.