A grasshopper has antagonistic muscles called the flexor and extensor muscles which ( are attached to the interior of the exoskeleton)
The rear legs are bigger and longer and (are adapted for jumping).
Flexor muscle contract to flex the leg / prepare for jumping.
Flexor muscle relaxed, extensor muscle contracts.
Causes the rear legs to extend and pushes against the ground
The thrust created propels the grasshopper forwards and upwards.
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