What is referred to by 'a sideways handspring'?

Based on the clue 'a sickle is a crescent shaped blade on a short han...', what is the answer? Based on the clue 'a side scan type of this helps the museum locate o...', what is the answer? Based on the clue 'a side trip from copenhagen should include a visit...', what is the answer? Based on the clue 'a sideways acrobatic movement onto the hands then...', what is the answer? Based on the clue 'a sight of lamentation its believed to have been p...', what is the answer? Based on the clue 'a sign above the visitors clubhouse at this detroi...', what is the answer? Based on the clue 'a sign in a store window in spain may say ici on p...', what is the answer? Who performed with 'a sign in this oregon capital marks the 45yh parallel half way between the equator and the north po…