A government scheme offering £50 bike repair vouchers will launch in England on Tuesday as part of plans to boost cycling and walking.
An initial 50,000 vouchers will be made available online just before midnight on a first come, first served basis.
The prime minister also announced that bikes will be made available on the NHS as part of the strategy.
But Labour said many of the government's proposals were taking too long to come into effect.
It comes after the government launched its obesity strategy on Monday.
GPs in areas of England with poor health will be encouraged to prescribe cycling, and patients able to access bikes through their local surgery.
Recent Public Health England research found that being overweight or obese puts people at greater risk of serious illness or death from Covid-19.
Government statistics showed nearly 8% of critically ill patients in intensive care units with the virus have been morbidly obese, compared with 2.9% of the general population.
Prime Minister Boris Johnson said cycling and walking have "a huge role to play" in tackling health and environmental challenges.
"But to build a healthier, more active nation, we need the right infrastructure, training and support in place to give people the confidence to travel on two wheels," he said.
"That's why now is the time to shift gears and press ahead with our biggest and boldest plans yet to boost active travel - so that everyone can feel the transformative benefits of cycling."
The government's "Fix Your Bike" vouchers are being released in batches "to help manage capacity" and so that the scheme can be monitored before being rolled out more widely, the government said.
They will typically cover the bill for a standard service and the replacement of a basic component such as an inner tube or cable.
During a Downing Street briefing in May, Transport Secretary Grant Shapps said the initiative would be "available from next month".
But the Department for Transport (DfT) said in July that it would only begin when maintenance shops could handle the expected spike in demand.
Halfords said it has thousands of slots available each day for customers to bring their bikes into stores to identify potential faults which could be rectified under the scheme.
"We think the government's 'Fix Your Bike' voucher scheme will not only help individuals become more confident about keeping their bikes maintained, but will help speed up the cycling revolution," said chief executive Graham Stapleton.
The retailer previously reported that bike sales had risen by 57.1% in the 13 weeks to 3 July, as people sought to avoid public transport during lockdown.
Thousands of miles of new protected cycle lanes, cycle training for children and adults, and the creation of the UK's first zero-emission transport city are also part of the plans to promote cycling and walking.
Other measures to improve the wellbeing of pedestrians and cyclists include strengthening the Highway Code, improving legal protections, increasing lorry safety standards and working with the police and retailers to tackle bike thefts.
The plans will be funded by a £2bn investment announced in February.
Mr Shapps said this is a "once in a lifetime opportunity to create a shift in attitudes" to make cycling or walking part of daily routines.
"The measures we've set out today in this revolutionary plan will do just that," he added.
Matt Mallinder, director of the charity Cycling UK, said the plan "places cycling at the heart of our towns and cities".
But he called for even more funding "to truly shift gears so that everyone can feel the transformative benefits of cycling".
Kerry McCarthy, Labour shadow cycling minister also said that the Conservative party had "failed to seize the opportunity this crisis has posed".
"Although funding is welcome, cyclists will be rightly concerned about how long it is going to take to actually put these plans into practice.
"No-one wants a return to the levels of pollution and congestion we saw before the lockdown began, but, if we fail to make our roads safe enough to cycle, people will revert back to taking the car."
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