“Lord, not my feet only but also my hands and my head!”
The day before Jesus is taken away to be crucified is full of drama in all the Gospel tellings of it. This is where we get our understanding of the Lord's Supper or Communion from, when Jesus broke bread and shared the cup of wine to foretell the meaning of his death. In John's Gospel uniquely, we are not told of the last supper but of the washing of the disciples feet.
Jesus here demonstrates to his disciples what kind of lives they are to lead. It is a kind of lowly service which he doesn't just teach but demonstrates, in this act foot washing and then in his going in humility to be put to death at the hands of sinners. Many churches historically have made a regular practice of foot washing as a way of reminding themselves of Jesus' command and his work on our behalf. Many Baptist and Brethren churches maintain to this day this radical sign of humility and service to one another. You will also see many churches offering a special service of this today which you might be blessed by attending.
Such an intimate act of care and service can be essential training for our life together as God's people. If we can comprehend the lowly act of washing another's feet or having our feet washed, then perhaps we can begin to trust our Christian sisters and brothers to take care of those other secret and hidden parts of our lives.
If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet. For I have given you an example, that you also should do just as I have done to you.
It might be appropriate to bring this act into the context of your community group as a deliberate act of worship and service to one another.