The chin-up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert a force of approximately 800 N as it contracts a distance of 7.5 cm in a 74-kg male. How much work can the biceps muscles (one in each arm) perform in a single contraction? J Compare this amount of work with the energy required to lift a 74-kg person 40 cm in performing a chin-up. How much is required? J Do you think the biceps muscle is the only muscle involved in performing a chin-up? Yes No Explain.