Muscular strength is a muscle's ability to generate force. The purpose of strength training is to increase muscle and connective tissue size, density, and toughness. Bigger muscles and stronger connective tissues are less prone to injury and aid in long term weight management. Muscle tissue also burns more calories than fat at rest. Strength training will also improve muscular endurance, or the muscles ability to perform repeated muscle contractions over a prolonged period of time. Muscle endurance is important for sitting, standing, walking, running, and any other activities of daily living. For example, consider sitting and surfing the web for an hour or more. Your neck muscles have to hold up your head (which weighs 12-15 pounds) for all that time. Now, that is muscular endurance
DEVELOPING STRENGTH
A warm-up is important to increase tissue temperature and flexibility before heavy demands are placed on the muscles. Walk or cycle at a moderate intensity for 5-10 minutes before strength training.
DOWNLOAD OF THE MONTH
Here is an excellent strengthening program for the legs, and you don't need any exercise equipment.
https://www.ptclinic.com/downloads/1-9.pdf
As always, consult your physician or physical therapist before you start this or any other exercise program.