Locomotion in Grasshopper

Some of the explanation for grasshopper is also applicable for frogs

Grasshopper have an exoskeleton

Muscles are attached to the inside of the exoskeleton, across the joints

They exist in antagonistic pairs known as flexor and extensor muscles
(Grasshoppers have three pairs of legs)

During walking movements:

body is supported on a tripod of three legs //the other three legs pull or push the body forward

The rear legs are bigger and longer, (adapted for jumping)

The extensor muscles attached to tendons

During a jump, the flexor muscles relaxed, extensor muscles contracts suddenly

Causing the rear legs to straighten

Energy stored in tendon propels the grasshopper into the air.

During flight, the wings moved forwards and backwards // upwards and downwards through the air

Owing to the contractions of the flight muscles

Which produces a lift ( by driving the air downwards which in turn )enables the grasshopper to( lift off and) fly.