I’ve previously mentioned the Ab Wheel, a dirt cheap but effective way to train the abdominal muscles.
There’s another cost effective piece of equipment you can buy and use at home: an exercise ball. They are versatile, inexpensive and great for training the abs–you can lean back on it and get a great stretch.
I’ve included a link to one that is rated highly on Amazon.com (see below), but you may want to just go to your local retail store and look around. You may also want to check out size recommendations–the one I have linked below is 75cm, but a shorter person may do better with a 65cm (or smaller).
Note: Remember that visible abs come from low body fat, not abdominal training.
About ten years ago one of my wrist started hurting during/after the bench press. I started using some kind of wrist wrap to see if it would help. The one I used wasn’t really made for weight lifting, but it did help. I eventually had the same problem with the other wrist. I’m not sure exactly why, but the compression hurts my wrists (maybe this is a common problem among lifters).
Anyway, the solution has been pretty simple–if I wear wraps, my wrists don’t hurt at all. I eventually ran across Inzer Wrist Wraps, and I’ve been using this brand for about a decade now, and I highly recommend them.