Final answer:
A physical fitness program is best supported by cardiovascular exercise for endurance and heart health, and strength training for muscle strength and overall health benefits.
Step-by-step explanation:
Two important parts of a physical fitness program are Cardiovascular Exercise and Strength Training. Cardiovascular exercise includes activities such as cycling, walking, and running, and is crucial for increasing muscle endurance and improving heart health. On the other hand, strength training involves exercises like weight lifting and resistance workouts that aim to build muscle strength.
Both types of exercise are integral for maintaining overall health, increasing bone density, improving cognitive function, and assisting in weight loss and weight maintenance as outlined in the evidence-based Physical Activity Guidelines by the HHS.