If you're looking to increase your grip strength, these finger exercises will definitely firm up your handshake. All you need is a really heavy book. Photo via Sasha Kargaltsev.
To get your hand muscles working, Brett and Kate McKay at The Art of Manliness recommend you try some old-fashioned strongman book lifting exercises. Place a heavy book on the edge of a table or counter (the heavier the better). Now slip your fingers under the book and lift it with one finger. Do several reps with each finger before moving on to the next. Next, flip your hand over, and do the same thing as before, only in reverse. Your hands will be super strong in no time. You can learn some more fun old-time exercises at the link below.
The Ultimate Guide to Oldtime Strongman Fitness: 26 Forgotten Exercises Every Man Should Try [The Art of Manliness]