Does anyone feel their shoulders burn more than their calves?

That's how i been feeling recently

Shoulders burn but calves dun feel a thing

Regular bounce only cos i cant do any other styles lol

Any way to increase endurance?

I've been skipping for almost year (following this app's workouts!), about 3 to 4x a week

I dun swing my arms at all, proper elbows tucked in n rotate wrists only