There certainly is strength in numbers. Take joint ventures, joint commissions, joint statements, joint maneuvers or joint peace talks. The joint effect of most things is stronger than the result of standing alone. 
There is also strength in forming a joint connection between two things such as mortar between bricks or a wood joint that links the ceiling to the floor or a knee that connects the lower leg to the upper leg. They all work to create a thing that is stronger, more complete, more effective than the single component.
Your challenge for the week is to apply this principle to your yoga practice. We’ve explored strength through alignment, now we will investigate the balanced effort of flexibility and strength. This is critical for the health of our joints. Hips, shoulders, elbows, spine, knees, ankles, wrists, and even the fingers and toes all benefit from this “joint concept” of mobility and stability.
Focus on one area each day this week to create joint mobility and stability. Be sure to warm up with a gentle sun salutation prior to beginning these sequences.
Hips Stabilize: Warrior III Mobilize: Eka Pada Rajakopatasana
Spine Stabilize: Utkatasana Mobilize: Cat/Cow
Shoulders Stabilize: Elbow Plank Mobilize: Gomukasana/Garudasana
Wrists Stabilize: Balasana to Half Dog (with correct hand position) Mobilize: Reverse Namaste
Ankles Stabilize: Ardha Chandrasana Mobilize: Malasana
Knees Stabilize: Parsvakonasana Mobilize: Virasana
Toes Stabilize: Tadasana (spread toes away from each other) Mobilize: From Vajrasana, lift forward, curl toes under & sit on heels.