Have done 40 or more push ups - up to 46 - six times now. Certainly the first 20 feel so easy, a marked contrast to when I started when 10 was a real effort. It has certainly helped on scrambly descents where upper body strength is essential to prevent over rapid progress. With respect to leg strength I have been timing the ascent of Wansfell Pike - from when the steps begin to the top - and have improved from 20 minutes to 17 - it is a shame I live in Suffolk!