Builder stronger abs, chest and shoulders with these 2 exercises.
Up down plank is a great progression from a normal plank. Start in a high plank on your hands and drop down to a low plank on your forearms. Try to keep your spine still by bracing your core.
The Push up rotations add more variety to your current training. Perform a push up and then lift your right arm up to the ceiling while rotating to the right, and then do the same on the left.