This tells you which muscle is more effective!!! enjoy
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CHEST
Pectoralis Major % iemg MAX
Decline dumbell bench press 93
Decline bench press (olympic) 89
Push-ups between benches 88
Flat dumbell bench press 87
Flat bench press 85
Flat dumbell flys 84

Pectoralis Minor % iemg MAX
Incline dumbell bench press 91
Incline bench press (olympic) 85
Incline dumbell flys 83
Incline bench press (Smith) 81

SHOULDERS
Medial Deltoids % iemg MAX
Incline dumbell side laterals 66
Standing dumbell side laterals 63
Seated dumbell side laterals 62
Cable side laterals 47

Posterior Deltoids % iemg MAX
Standing dumbell bent laterals 85
Seated dumbell side laterals 83
Standing cable bent laterals 77

Anterior Deltoids % iemg MAX
Seated Front Dumbell Press 79
Standing Front Dumbell Raises 73
Seated Front Barbell Press 61

BACK
Latissimus Dorsi % iemg MAX
Bent over barbell rows 93
One arm dumbell rows 91
T-bar rows 89
Lat pulldowns (front) 86
Seated pulley rows 83

BICEPS
Biceps Brachii (long head) % iemg MAX
Biceps Preacher Curls (Olympic Bar) 90
Incline Seated Dumbell Curls (Alternate) 88
Standing Biceps Curl (Olympic Bar/Narrow Grip) 86
Standing Dumbell Curls (Alternate) 84
Concentration Dumbell Curls 80
Standing Biceps Curls (Olympic Bar/Wide Grip) 63
Standing E-Z Biceps Curls (Wide Grip) 61

TRICEPS
Triceps Brachii (outer head) % iemg MAX
Decline Triceps Extensions (Olympic Bar) 92
Triceps Pressdowns (Angled Bar) 90
Triceps Dip Between Benches 87
One-Arm Cable Triceps Extensions (Reverse Grip) 85
Overhead Rope Triceps Extensions 84
Seated One-Arm Dumbell Triceps Extensions (neutral grip) 82
Close-Grip Bench Press (Olympic Bar) 72

LEGS
Rectus Femoris (Quadriceps) % iemg MAX
Safety Squats (90 Degree Angle, Shoulder-Width Stance) 88
Seated Leg Extensions (Toes Straight) 86
Hack Squats (90 Degree Angle, Shoulder-Width Stance) 78
Leg Press (110 Degree Angle) 76
Smith Machine Squats (90 Degree Angle, Shoulder-Width Stance) 60

Biceps Femoris % iemg MAX
Standing leg curls 82
Lying leg curls 71
Seated leg curls 58
Modified hamstring deadlift 56

Semitendinosus % iemg MAX
Seated leg curls 88
Standing leg curls 79
Lying leg curls 70
Modified hamstring deadlift 63

Gastrocnemius % iemg MAX
Donkey calf raises 80
Standing one leg calf raises 79
Standing two leg calf raises 68
Seated calf raises 61