Forearm training is pretty simple. If you want to develop size and strength, I would recommend quit using wrist straps. The gripping of heavy bars and holding on to heavy weight such as rows, deads, and shrugs will contribute to forearm development. Also, feel free to throw in these exercises:
1. Wrist Curls - 4 x 12-15
2. Reverse Wrist Curls - 4 x 12-15
or on bicep day:
1. Reverse Barbell Curls - 3 x 8
2. Hammer Curls - 3 x 8
You can honestly, train forearms every other day. The forearms = calve muscles. They are both very dense and require intense training to recruit the muscle fibers to develop. I hope this helps.