Tooltips

design or provide with a form that presents very little resistance to a flow of air or water, increasing speed and ease of movement.

Requiring great efforts

in a way that requires great physical exertion. with great effort and determination. in a way that uses a lot of physical or mental effort.

Walk with long, decisive steps in a specified direction

Attracting attention by reason of being unusual, extreme, or prominent.  

strict

Try hard to achieve something

Make great efforts to achieve something

walk in a leisurely way.

walk in a leisurely way.