The rehabilitation period for a CrossFit hamstring injury varies based on: The scale of the damage, whether it is a torn or pulled hamstring Age Overall physical fitness level and general health History of torn hamstring The part of the hamstring or tendon that is torn Based on the rate of the damage (the number of muscle fibers that are torn), a hamstring strain recovery period can be longer or shorter. A partial hamstring pull or tear can take 4 to 8 weeks to heal. A more serious Crossfit hamstring injury can take 12 weeks. Recovery duration for a torn tendon is much longer. It can be from 3 months and more if you have surgery. In severe Crossfit hamstring injury, returning to work or exercise should be consulted with a doctor.