Which organ is made mostly of cardiac muscle?
AnswerThe heart
Cardiac muscle is found only in the heart, where it contracts rhythmically to pump blood.
Fitness · Facts & stats
My Fitness facts & stats
7 fact-checked facts about fitness, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does 'aerobic' mean in aerobic exercise?
AnswerUsing oxygen
Aerobic exercise relies on oxygen to produce energy, as in steady walking, swimming or cycling.
Going deeper
Which is the largest muscle in the human body?
AnswerGluteus maximus
The gluteus maximus in the buttocks is the largest muscle and helps extend the hip.
What connects a muscle to a bone?
AnswerA tendon
Tendons attach muscle to bone, while ligaments connect bone to bone.
Which muscle does most of the work when you breathe in?
AnswerThe diaphragm
The dome-shaped diaphragm contracts and flattens, drawing air into the lungs.
Expert level
Which two lifts are contested in Olympic weightlifting?
AnswerSnatch, and clean and jerk
Olympic weightlifting uses the snatch and the clean and jerk; squat, bench and deadlift belong to powerlifting.
Lowering a weight slowly, so the muscle lengthens while under load, is which kind of contraction?
AnswerEccentric
In an eccentric contraction the muscle lengthens under tension, as the biceps does when lowering a curl.
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