The barbell back squat is essential for strength and conditioning.
Pull-ups are an excellent bodyweight upper-body and grip workout.
Lunges are important lower-body exercises that enhance balance and coordination.
Overhead shoulder presses are great for upper body strength, especially shoulders and arms.
Seated rows strengthen the back and enhance posture, which is great for 40-year-old males.
This list of better workouts for 40-year-old guys ends with glute bridges.