for fingertip baring strength you’ll want to just slowly, progressively overload the fingers. The best way I find to do so is to first just start out by leaning on your knees with your finger tips after a warm up and stretch of course then over time work to be able to get into a push up position on your finger tips then grab a resistance band and attach it to a pull up bar and get into a tucked hold on finger tips then after a little while your finger tips will get used to the load and should be able to bare in the tucked position from there it’s a matter of building endurance