Do not be slothful in zeal, be fervent in spirit, serve the Lord. Romans 12:11
Greg Koukl says, "The more you sweat in training the less you bleed in battle." The New Testament prescribes a non-slothful Christianity. This requires practice. Practice assumes trying, failing, stretching, gain, until the goal is achieved. In regards to spirituality, followers of Christ need to avoid slothfulness and develop their character, gifts, and fruit through practice.
The following clips illustrate what training, practice, and hard work can achieve in the "secular" realm. May they give us some inspiration to develop our spiritual life in Christ.