This makes your whole body rock from side to side wasting energy and tiring your legs unnecessarily quickly.

Too low a seat, when legs get crunched, or too high, when you rock from side to side, can cause knee problems.

There are often flocks of them floating on the water, and when they fly up they rock from side to side.

Too high and you will rock from side to side, which can cause knee problems over time.

These tiny seabirds rock from side to side as they whirr over the water.

I want to be the best rock singer of this time.

The 68-year-old rock singer collapsed 'due to severe dehydration', according to his spokesman.

The wailing rock singer has been carefully tending to this wonderful piece of face flora.

The heavy rock singer turned folk troubadour continues to grow in popularity.

It's a bold step for a full-on rock singer to leave their vocals and lyrics this exposed.

I thought the bravest thing to do was make a dinky electronic pop song, rather than flex our muscles and make a big rock song.

I felt uncomfortable with one of his selections, a soft rock song done in a falsetto.

These are words that would be far from regular fare in a country or rock song.

Fleeing glimpses of a rock song, of a love-song, perhaps, pass, as simple rhythms form out of the aural mist.

But what will be the arena's last rock song?

To anybody else, the shallow circle might have looked like one more patch of boring sedimentary rock.

For 'shale' read 'fracking', hydraulic fracturing, firing highpressured jets of water into small cracks, or fractures, in underground rock formations — generally shale, a soft, mud-based sedimentary rock — to extract gas.

You need sedimentary rock, such as sandstone or slate: something soft enough to have been ground into an appropriate shape by the sea.

Instead, it lies trapped within a type of organic-rich, porous sedimentary rock.

These deposits probably consist of both sedimentary rock and poorly indurated or unconsolidated sediments.

Many of them are so deep that you can spend entire days gliding past waterfalls as they cascade over sheer rock faces.

A chanting chorus and dynamic song structure make it an earful of sheer rock power.

Sheer rock plummets 100ft to a churning sea.

It was here, however, that he found the resource that helped save his life: water, springing miraculously from a sheer rock face.

Then we lie without a care on its remote pebble beach at the foot of a sheer rock face.

The ancient cliffs are contorted with zig-zag folds, and longs ribs of smooth rock reach out into the sea.

As the sun rises, we climb a vast dome of smooth rock.

When he finally stops twisting, he reattaches himself limpet-like to the smooth rock and begins to inch his way back up.

An hour later, we were out of the trees, scrambling through grassland, then across smooth rock.

Spawning takes place on a smooth rock or clean sand bed.

A building on solid rock would be the least shaky spot.

A 31-ton drill yesterday began boring through the solid rock to create a rescue tunnel.

Unless you have a heart of solid rock, you will cry buckets.

Piles are concrete or steel columns hammered into the ground until they penetrate solid rock.

When earthquake tremors hit solid rock, the rock simply shakes.

As he tried to secure the boat by attaching a heavy anchor to the quay, strong waves rocked the vessel.

Less than two weeks earlier, 50ft waves rocked the liner, sending people flying across deck.

Heavy waves rocked the helpless clipper from side to side.