Inactivity, on the other hand, can cause muscles to become weaker and less able to support painful joints.

The sapling must be pruned to prevent too many weak joints from surviving.

Strong muscles help keep weak joints stable and comfortable and protect them against further damage.

So he ceased to reproach himself, and began to think how he might yet remedy the deficiencies of Jack's weak joints.

The latter is chiefly intended to protect a healthy knee against injury and to give confidence to those with inherently weak joints.

They include rubber parts not made thick enough to withstand engine heat and joints too weak to hold together.

Strong toned muscles will support weaker joints, too.

Strengthening exercises build muscle strength to stabilize weak joints.

A running gag throughout the series is that he has weak joints and no sense of direction.

This last point is probably the most frequent cause of weak and poorly soldered joints.