What is a one-sentence summary of the following article?
One way to enhance spontaneity is to surprise your love with a hug from behind. As long as they aren't doing anything too important, wrapping your arms around their waist, and resting your head against theirs can be a super sweet surprise. Press your torso up against the back person you are hugging, and wrap your arms around them. It doesn't matter so much if you are taller or shorter, other than where your hands will end up. Generally, the taller hugger relaxes their upper arms, and reaches around to hug with their lower arms. The shorter hugger can hold their arms straight out, rather than bending at the elbow. You can "stack" one arm on top of the other, one arm in front of the other, or even reach up over the chest and hold the shoulders of the person you are hugging; it all depends on the size of your arms and the size of the hugged one where your arms are best placed. Like the front-facing hug, leaning your head on or against someone is a signal of intimacy. If you are as tall or taller than the hugged one, you can nuzzle their face or neck. If you are shorter, you can rest your head sideways on their back. A romantic hug lasts longer than a platonic hug. Gently clutch a little tighter for two or three seconds. Take a deep breath and exhale; relax into the hug and enjoy it. For the person being hugged, caressing your huggers arms is a natural, lovely touch. You can also reach back and caress their face or hair. For the hugger, though, caressing can become fairly intimate without much effort. If you're at that level with the person you are hugging, this is a delightful way to begin intimacies. If not, proceed with caution. It can result in the ice being broken, or your nose being broken. A slow caress is romantic. Enjoy a front-facing hug as you enjoy the closeness of your partner. Should you need further direction, start at the top of the page again. Enjoy!

Summary:
Come from behind. Stand behind the person you are going to hug. Place your arms in front. Make head contact. Squeeze and hold. Use your hands. Rotate your hugged one around.