Challenge your grip and increase your pull up strength pt 2

This is part 2 of a selection of things I am using to change up my pull up training, if you haven't seen part 1, click here to check it out
Baseballs

Just put a bolt through a baseball and hook it to a chin up bar, you can also use hockey ball or anything strong enough to hold your weight. This requires a whole new level of grip strength. When training these with lock offs, it would give me a dead arm after every rep, this will kill your biceps as well.
Fat gripz

These are grips, that are fat. They will make the chin ups more difficult. Stick them on the bar and use them for the next 4 weeks, take them off and your chin ups will be stronger
Gymnastics rings

These are difficult as hell, but I am not really sure why, one arm chins on this are crazy difficult for me, but I'm working on it.
Rock rings

These are a cool tool by Metolius, normally used by rock climbers. They have 3 levels, each one gets more narrow and the ledge gets smaller, making it more challenging, you can also grab the top and just use it as a chin up handle. I am currently using them to try and get a door frame one arm chin. So I can do them Anywhere.

Thanks, hope this helps,
Enjoy the gains
Alex