failure -> discovery

Woke (well ok was roused by my daughter) and checked my exercise sheet for the day. Oops, pull-ups and kung-fu situps, both ofwhich require the pull-up bar. Which I have. What I do not have is a door frame onwhich I can use it. Every door in my apartment - in my entire BUILDING - either goes all the way up flush with the ceiling or simply has no upper frame onto which the cleverly designed pull-up bar can hook.
I do however have a new old kitchen table.
So I did inclined pull-ups under the table and discovered a few things:
1- I did all ten of all five sets, and the burn was relentless and inspiring.
2- If I grip the table with palms facing front, it is an awesome forearm workout too.
Obviously could not do kung-fu situps under the table so did 100 leg-lifts instead. A feeble replacement. As Patrick says: if you can do 100 of anything it is not working! So I need to solve the pull-up bar issue or get an ab workout that is at least as gnarly as kung-fu situps!