Question

cody wants to strengthen his arms. what exercise should he do?
sit - ups
push - ups
jumping jacks
running
question 4
what is a good activity for improving muscle endurance?
biking
stretching
doing yard work
lifting heavy things

Explanation:

First Question (Cody's Exercise):

Sit - ups mainly target abdominal muscles. Jumping jacks and running are more for cardiovascular fitness and overall body movement but not arm - specific strengthening. Push - ups engage the arm muscles (biceps, triceps) to a great extent, so they are suitable for strengthening arms.

Stretching is for flexibility. Doing yard work is a mix but not a typical muscle endurance - focused activity. Lifting heavy things is for muscle strength (hypertrophy/strength gain, not endurance). Biking is an aerobic activity that, when done with moderate resistance or for a long duration, helps improve muscle endurance (especially in leg muscles) as it involves repeated muscle contractions over time.

Answer:

B. push - ups

Second Question (Muscle Endurance Activity):