Related by context. Frequent words. (Click for all words.) 78 abdominal muscles 74 muscle 66 muscle tissue 65 tendons 64 abs 63 Muscles 60 hamstrings 59 thighs 55 biceps 55 legs 55 ligaments 55 triceps 54 muscular 53 blood vessels 53 joints 51 vocal chords 51 internal organs 51 lungs 51 hips 50 diaphragm 50 spine 50 vocal cords 50 forearms 50 limber 49 connective tissue 49 aerobic 49 limbs 49 spinal cord 49 metabolism 48 lifting weights 48 lactic acid 47 synapses 47 collagen 47 bladder 47 abdominal 47 brain 47 ribcage 47 tummy 46 soft tissues 46 pelvis 46 aerobic exercise 46 hair follicles 46 exertion 46 shoulder blades 46 intestines 46 lift weights 45 treadmill 45 extremities 45 cardio 45 bones 45 ankles 45 nerve cells 45 electrical stimulation 45 physiologically 45 arteries 45 rib cage 45 vital organs 45 tissues 45 elasticity 45 brains 45 ligament 45 torso 45 dumbbells 45 body 45 buttocks 44 spinal column 44 bone density 44 capillaries 44 physique 44 scar tissue 44 tendon 44 glands 44 quadriceps 44 muscle spasms 44 stiffness 44 belly fat 44 left ventricle 44 lunges 44 stomach 44 endorphins 43 testicles 43 flabby 43 gland 43 Muscle 43 exercises 43 gait 43 aorta 43 abdomen 43 squats 42 bicep 42 pilates 42 stamina 42 spines 42 cartilage 42 torsos 42 relieve stress 42 mitochondria 42 bone 41 toning 41 metabolic 41 appendages