It bothers me a little bit that it is considered a 'spiritual discipline' to attend church. What's so spiritual about showing up to a building once a week? And how is it considered a discipline as though it took real work? I understand people's intentions in crying that we go to church, but Scripture doesn't say that the early believers committed to 'attendance.'
Check out Acts 2:42-47

There are two parts to 'being the church' that I see in those verses:
1) They focused on building each other up.
The early church wanted each other to love Jesus more every day. That's why the writer of Hebrews said "And let us consider how to stir up one another to love and good works, not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near" (Hebrews 10:24-25

A part of being the church isn't singing in unison with each other on Sunday during the worship set, but loving Jesus in unison with each other. In the same way that you would correct someone who is singing the wrong words to a song, we are to correct our brothers and sisters who are living wrong.
The church is supposed to push each other foreword; help each other get out of our comfort zones. This does not just happen on Sundays and Wednesdays, but every moment of every day. Sunday and Wednesday are special times when many of us gather together in one place and it's supposed to be awesome and encouraging, but 'being the church' should only grow from there into the rest of the week.
Not just spiritual needs were met however. If you want to be the church, you need to help each other in any way God leads. If that means mowing their lawn, taking their kids to school, giving them financial help, calling them when they are sick, etc. All of this is what will happen when we focus on being the church instead of just going to church.
2) They focused on changing the world.
The early church were known for turning the world upside down (Acts 17:6

Members of the body of Christ are supposed to go in the power of the Holy Spirit and the truth of God's Word to carry the Gospel of Jesus Christ into a world that s desperately needs it. So many churches are imploding because they are so focused on themselves that they have almost become this secret club.
I love the movement where people are all over social media with the hashtag "ilovemychurch." It's so cool to see people excited about being a part of a gathering of believers. If we aren't careful though we will only be excited about going to a social club instead of being the church.
So let's show people that "church" is something you are, not something you do. It's a movement, not a club. That's why I'm so glad that at South Shore we don't have 'members' we have 'partners.' Christians need to get over being more focused on what they get out of church than what they put into it. We are so selfish though aren't we? Everything becomes about us being comfortable and entertained. When did the gospel take second place to the order of service?
Folks, when we understand that we have been redeemed and we are a part of a 'people' that have been redeemed, church stops becoming something we go to; it becomes who we are. That is when it really becomes a spiritual discipline. So don't go to church, be the church.