Ditch your weights, and start in a high plank position on your mat. Shoulders should be over your wrists with your belly button pulled in. Squeeze your glutes. Look down at the ground to maintain a neutral spine.
Slowly lower your chest to the ground, and keep your elbows close to your sides as you bend them (your elbows should graze your rib cage as you lower down).
Press your palms into the ground, and think about pushing through your chest and triceps as you raise yourself back up to a plank position.
Once you've reached your plank position, alternate knee drives to your chest four times; these are your mountain climbers.