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Strength Train With The Proper Exercises

The best exercises to use are big, compound movements that recruit a lot of muscle mass. Here are some examples:
Lower Body

Barbell Squat
Barbell Deadlift
Dumbbell Lunges
Good Mornings
Split Squat

Upper Body Horizontal Pushing

Pushups
Dumbbell Bench Press
Barbell Bench Press
Incline Bench Press

Upper Body Vertical Pressing

Military Press
Dumbbell Shoulder Press
Handstand Pushups

Upper Body Vertical Pulling

Chin-Ups
Pullups
Lat Pulldowns

Upper Body Horizontal Pulling

One-Arm Dumbbell Rows
Seated Cable Rows
Bent Over Barbell Rows

Core Exercises

Planks
Ab Roller
Hanging Leg Raises

If you spent the rest of your strength training career using nothing but the exercises listed above, you would build a lean and sexy body no questions asked.

You would also build a better body at a faster rate than if you used isolation exercises and machines.